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Mathematics Questions and Answers March 28, 2023

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Identify the sampling techniquesused, and discuss potential sources of bias(if any). Explain: In1965, researchers used random digit dialing to call 800 people and ask what obstacles kept them from exercising. What type of sampling wasused? A. Simple random sampling wasused, since each number had an equal chance of beingdialed, so all samples of

A researcher wanted to determine if using an octane booster would increase gasoline mileage .A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster. Use the definitions of X 1 and X 2 as given in the table. Take d= X 1 - X 2 = Without booster - With booster. X 1 =mileage

According to Harper's Index , 45% of all federal inmates are serving time for drug dealing. A random sample of 15 federal inmates is selected. (a) What is the probability that12or more are serving time for drug dealing? (Use 3 decimal places.) (b) What is the probability that7or fewer are serving time for drug dealing? (Use 3 decimal places.) (c)

Problem 5. Forty part-time students were asked how many courses they are taking during this term. The incomplete results are shown below: Problem 5. Forty parttime students were asked how many courses they are taking during this term. The incomplete results are shown below: Number of Frequency Relative Cumulative Relative courses taken Frequency
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Tool workers are subject to work-related injuries. One disorder, caused by strains to the hands and wrists, is called carpal tunnel syndrome. It strikes as many as 23,000 workers per year. It is estimated that the average cost of this disorder to employers and insurers is ap- proximately $30,000 per injured worker. Suppose these costs are normally

1. State your null and alternative hypothesis 2. Identify the test statistic relevant to the test and determine its sampling distribution 3. Compute the appropriate descriptive statistics (Sample Mean x-bar, Sample Standard Deviation s, Sample Variance, s^2, Sample proportion P^, Sample size n, degrees of freedom) needed to calculate the test

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What is at risk when the grey literature is excluded from a meta-analysis? A.The risk is that studies with nonsignificant results will be underrepresented. B.The risk is that studies with weak effects will be overrepresented. C.The risk is that studies with biases will be overrepresented. D.The risk is that studies not published in English will be

A simple random sample of FICO credit rating scores is listed below. As of this writing, the mean FICO score was reported to be 678. Based on these results, is a FICO score of 500 unusual? Why or why not? 714, 751, 664, 789, 818, 779, 698, 836, 753, 834, 693, 802

In 1997, a survey of 900 households showed that 161 of them use e-mail. Use those sample results to test the claim that more than 15% of households use e-mail. Use a 0.05 significance level. Use this information to answer the following questions. A. What is the test statistic? z= B. What is the P-Value? P=

The probability distribution of the number of pets x per household in a certain locality is given in the following table. x 01234P( x )?.28.40.10.07 Find the expected number of pets in this locality. 1.66 2.27 0.74 1.25 0

Business math. What will be the total deduction for social security and Medicare taxes on Ronnie's next semimonthly paycheck of $3,960, if she already earned $42,560 this year? Social security tax is 6.2% of gross wages up to $117,000. Medicare tax is 1.45% of all gross wages.

Virtual Research Assignment (complete in an Excel document): 1. In this VRP assignment you should select two continuous variables (one variable as the dependent variable and the other as the key independent variable) from your research data set to complete the analyses below. If you only have binary variables, with the permission of the

14. Find the value of the linear correlation coefficient r. x 8.0 5.0 7.0 7.0 10.0 y 7.0 10.0 5.0 6.0 6.0

Assume that you want to construct a95% confidence interval estimate of a population mean. Find an estimate of the sample size needed to obtain the specified margin of error for the95% confidence interval. The sample standard deviation is given below. Margin of error=$ 4 , standard deviationequals=$ 19 The required sample size is _________________.

Find the minimum sample size n needed to estimate mu for the given values ofc, , and E. c=.90 = 8.5 E=1

what would n technically have to satisfy to make x^2 test valid? I know it has to be greater or equal to 5 but is that for every cell?

A probability experiment is conducted in which the sample space of the experiment is Upper S equals StartSet 7 comma 8 comma 9 comma 10 comma 11 comma 12 comma 13 comma 14 comma 15 comma 16 comma 17 comma 18 EndSetS={7,8,9,10,11,12,13,14,15,16,17,18} . Let event Upper E equals StartSet 10 comma 11 comma 12 comma 13 comma 14 comma 15 comma 16 comma

Prove or disprove: There is a noncyclic abelian group of order 51.

What is the appropriate z / 2 value for a 77.3 % confidence interval for ? Round your response toat least 2 decimal places.

Data Set A $24,067.00 $25,481.00 $26,129.00 $27,262.00 $28,055.00 $28,711.00 $29,680.00 $32,385.00 $34,261.00 $35,228.00 Data Set B 302.4 230.4 370.8 280.8 228.6 361.8 295.2 183.6 304.2 288.0 $36,435.00 $42,879.00 $43,928.00 $44,297.00 $44,552.00 $46,984.00 $47,116.00 $47,605.00 $48,131.00 $48,878.00 262.8 345.6 333.0 271.8 302.4 273.6 297.0 320.4

Recall that Kn is the simple graph with n vertices with every pair of vertices adjacent (the complete graph on n vertices). Circle all n for which Kn has a Hamiltonian Circuit. a. 3 b. 4 c. 5 d. 6 e. 7

A basketball player makes 80% of her free throws. Recently during a very close game, she shot 5 three throws near the end of the game and missed 3 of them. The fans booed. What is the probability of her missing 3 (or more) free throws out of 5? Set up and conduct a simulation (using the random digits below) with 10 repetitions.

Calculate the correlation coefficient of the data. Briefly characterize the correlation in words(for example, moderate positivecorrelation, weak negativecorrelation). CountryDeath RateSpeed Limit 12.954 23.254 33.354 43.469 54.054 64.259 74.654 84.864 95.059 106.074 r=________________ (Round to two decimal places asneeded.)

Find the coefficient of x^3y^6 in the binomial expansion of (x+y)^9 A fair die is tossed twice. Find the probability of getting at most 2 on the 1st toss and neither 5 nor 6 on the second toss.

Fill in the blank. TheF distributionis________andskewedtotheright.The F distributionhastwonumbersofdegreesoffreedom: df forthenumeratorand df forthedenominator.Theunitsofan F distribution,denotedby F ,arenonnegative

Perform the indicated calculation. 8C3/11C3 8C3/11C3= (Round to the nearest thousandth as needed.)

PUBH 350 EPIDEMIOLGIC STUDY - GROUP PROJECT The purpose of this exercise is to give you an opportunity to design an epidemiologic study, and in so doing, think through a series of methodological issues. Students will be assigned to groups of three or four for this project. I am aware of the pit-falls of group projects, but I want you to work as a

CPU on Demand offers real time high perfomance computing services. CPUD owns 1 supercomputer that can be accessed through the internet. Their customers send jobs that arrive on average every 3 hours. The standard deviation of the interarrival time is 5 hours. Executing each job takes on average 2 hours on the supercomputer and the standard

Willow Brook National Bank operates a drive-up teller window that allows customers to complete bank transactions without getting out of their cars. On weekday mornings, arrivals to the drive-up teller window occur at random, with an arrival rate of 18 customers per hour or 0.3 customers per minute. In the same bank waiting line system, assume that

Suppose a brand of light bulbs is normally distributed, with a mean life of 1800 hr and a standard deviation of 100 hr. Find the probability that a light bulb of that brand lasts between 1690 hr and 1980 hr. The probability that a light bulb will last between 1690hr and 1980 hr is? I need help with the methods of solving simplified for someone who

4.The following data give the one-way commuting times (in minutes) from home to work for a random sample of 50 workers. 23 17 34 26 18 33 46 42 12 37 44 15 22 19 28 32 18 39 40 48 16 11 9 24 18 26 31 7 30 15 18 22 29 32 30 21 19 14 26 37 25 36 23 39 42 46 29 17 24 31 What is the frequency for each class 09, 1019, 2029, 3039, and 4049. Calculate

hi, i need help with my math assignment. Question number 7 from the first picture below, question number 16 and another question number 7 from the third picture ` Pathway / Algebra Problemi S``` X| Homework HELP - QB` From On X` YA MITHY T E Assignment # $ 2 1 4. 4 , 4 X \\Hawvel angle* X + D > > ( & Hittus`in` webassign . net`ED *Student
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This is a question about differences of accumulated change, thank for your help! R2 = 524 . See the figure below. If r(X) is the rate of change of the revenue of a business and C(X) is the rate of change of the costs of the business X months after its establishment (both are measured in thousand dollars per month). The area of region R1 = 122 and
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1.)Taltson Lake is in the Canadian Northwest Territories.This lake has many northern pike.The following data was obtained by two fishermen visiting the lake.Let x = length of a northern pike in inches and let y = weight in pounds. x (inches) 20 24 36 41 46 y (pounds) 2 4 12 15 20 a.)Draw a scatter diagram. Using the scatter diagram, would you

Bupenorphamine contains a concentration of 0.3mg/ml. what volume must be administered to a 7 lb cat to achieve a dosage of 0.005mg/kg. ?

Step 1 Give a real-world example. Offer an example of when you would use a normal curve and compute z-scores in the real world. Step 2 Calculate z-Scores. Using the above example, create raw data in order to calculate probabilities using the z-score and z-table. Use the Standard Normal Distribution Table (handout = Standard Normal Distribution

The number of recognized blood types varies by species, as indicated by the table on the right. Find the mean, median, and mode of this data. The mean is (Type an integer or decimai rounded to two decimal places as needed.) The median is i The mode is i (Use a comma to separate answers as needed.)

Suppose now that this is a relatively big project for Chang. Therefore, she decides to use expected utility as her criterion, with an exponential utility function. Using some trial and error, see which risk tolerance changes her initial decision from go ahead to abandon when p1 50.4, p2 50.8, and p3 50.1.

Activity Immediate Predecessor Activity Time a -- 3 b -- 4 c a 4 d a 6 e b 5 f c,d 4 g e,f 7 What is the latest time for Activity F? What is the possible time that Activity E can be started without delaying the completion of the projection? Can someone assist me with these questions? Thank you!!

Given the upcoming NBA (professional basketball) draft, there are several players available with skills at different positions (e.g., point guard) and with or without college experience. The table below summarizes these data. (Use the data below for this question only) College Experience (CE)No College Experience (NCE) Point Guard(PG)3613 Shooting

I am being asked what the interpretation for these two confidence intervals look like and I am not sure how to do that. I have already worked through the original population problems and need help. One: 95% confidence intervals 1280 people were polled, 575 approve of president: First confidence interval: (.4219, .4765) Two: Using the same

Week 6 Homework 1)Calculate a 'relative risk' factor & 'risk ratio' for the below problem (use the numbers given to you below and base calculation on chapter 14 example for relative risk ratio): Over the past year, a number of teenagers have died in traffic accidents.Texting has been associated with some teenage accidents.Determine the risk and
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Problem 1. Let X1,..., Xn denote a random sample from the uniform distri bution on the interval (0, 6). Dene two estimators T1 = 21?\
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What is the hypothesis of the study, the explanatory variable and response variable of the study. The study is Napping during breaks on night shift: Critical care nurse managers' perceptions BY MARIE P. EDWARDS, PHD, RN, DIANA E. MCMILLAN, PHD, RN AND WENDY M. FALLS, PH D.

Let Y=X 2 Find the pdf of Y when the distribution of X is N(0,1).

Consider a t distribution with23 degrees of freedom. ComputeP(-1.01

Create THREE data displays (e.g., histogram, bar graphs, line graphs, or pie charts) that areappropriatefor each chosen variable. There should be one nominal, one ordinal, and one interval or ratio level variable chosen for this assignment. You may use the variables chosen for Assignment #1, if they were chosen appropriately.(To understand what is

One real life example where regression analysis may be useful is the relationship between the selling price of a car and the odometer reading.What is the independent variable? What is the dependent variable?

If a phone company sends a random 6-digit number to customers to activate their phone, how many potential numbers are there?

attachments_28b41a697f7db3adf9ab9cc03185f5c4a16d81d5 Date Open High Low Close Volume 17-Mar-17 851.61 853.4 847.11 852.12 1716471 16-Mar-17 849.03 850.85 846.13 848.78 977560 15-Mar-17 847.59 848.63 840.77 847.2 1381474 14-Mar-17 843.64 847.24 840.8 845.62 780198 13-Mar-17 844 848.68 843.25 845.54 1223647 10-Mar-17 843.28 844.91 839.5 843.25

STAT 200 Final Examination Fall 2017 OL1 Page 1 of 10 STAT 200 Introduction to Statistics Name______________________________ Final Examination: Fall 2017 OL1/US1 Instructor __________________________ Answer Sheet Instructions: This is an open-book exam. You may refer to your text and other course materials as you work on the exam, and you may use

Project 2 BAUD 3355 900 Fall 2017 Due 12/06/2017 (Wednesday) Project 2 is due at the beginning of class. Use the \"Project 2 data\" data set. You may use Excel to help you with the statistical analysis. Abstract: This dataset contains textbook prices from two different vendors: College Bookstore & Online Retailer. The data set for this experiment

Statistics, what do you mean ??? Please review the two videos below and include the answers to the questions listed under the video links in your initial discussion entry. Video 1: https://www.youtube.com/watch?v=p8dz1znP5_g Video 2: https://www.youtube.com/watch?v=TK6tIkpkt8Q Let us use our Week One Academic Conference as a warm-up and

The table below shows the results of a survey that asked 2871 people whether they are involved in any type of charity work. A person is selected at random from the sample. Complete parts (a) through (e). Frequently Occasionally Not at all Total Male 228 452 797 1477 Female 208 440 746 1394 Total 436 892 1543 2871 (a) Find the probability that the

Reyesburg Corporation is contemplating using a new, more expensive glue in the construction of its laminated veneer lumber. Of importance to the company is the variability of the carrying load of the lumber. The company has tested 50 beams using the new glue, recording for each beam the pressure (in pounds per square foot) at which the beam

Time it takes to get to work using 2 different routes Route A Route B 26 36 28 38 31 33 29 31 24 28 32 27 25 29 23 32 36 35 29 34 26 29 24 30 28 34 31 33 33 36 22 29 28 27 27 28 23 33 26 36 31 37 33 39 35 27 26 26 29 31 27 33 28 35 27 37 29 39 31 29 23 27

If the coefficient of multiple determination is 0.81, what percent of variation in the dependent variable is not explained by the independent variables included in the model? 19% 81% 90% 10%

On each trial of an experiment, a subject is presented with a constant soft noise, which is interrupted at some unpredictable time by a noticeably louder sound. The time it takes for the subject to react to this louder sound is recorded. The following list contains the reaction times (in milliseconds) for the trials of this experiment: 311, 261,

For the time series below, enter the naiive predictions. Then calculate the error for each prediction. Time 2 3 6 IN 8 Data 1 6 1 V 3 7 1 5 Prediction Error MAE = MSE = RMSE =
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During the development phase of an intervention, which type of validity is especially salient? A.Statistical conclusion validity B.External validity C.Construct validity D.Internal validity

1. According to a study conducted by Dell Computers, 65% of men and 70% of women say that weight is a very important factor in purchasing a laptop computer. Suppose this survey was conducted using 374 men and 481 women. Do these data show enough evidence to support the conclusion that there is no difference in the proportion of men and women who

An important function of a firm?s resources manager is to track worker turnover.As a general rule, companies prefer to retain workers.New workers frequently need to be trained and it often takes time for new workers to learn how to perform their jobs.To investigate nationwide results, a resources manager organized a survey wherein a random sample
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A workshop produces 2000 units of an item per day. The average weight of units is 130 kg with a standard deviation of 10 kg. How many units are expected to weigh less than 142 kg?

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There are the following results for a given period: Expected completion time of the given project = 44 Variance of project completion time = 5.54 What is the probability of completing the project over 40 days? A.0.957 B.0.886 C.0.896 D.0.853

Find the final amount in the following retirement account, in which the rate of return on the account and the regular contribution change over time. $279 per month invested at 6%, compounded monthly, for 7years; then $519 per month invested at 7%, compounded monthly, for 7 years. What is the amount in the account after 14 years?__________ (Round

Two events A and B are investigated: P(A)=0.35, P(B)=0.72, the percent chance that at least one of event A or B occur is 90%; What is the probability that only one of the events happens is?

The standard IQ test has a mean of 101 and a standard deviation of 16. We want to be 98% certain that we are within 4 IQ points of the true mean. Determine the required sample size.

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Solve the equation by factoring and using the zero product principle.2d 3 +3d 2 +8d-12=0

Public Policy Polling recently conducted a survey asking adults across the U.S. about music preferences. When asked, 80 of the 571 participants admitted that they have illegally downloaded music. What is a 99% confidence interval for the true proportion of American adults who have illegally downloaded music. b. This survey was conducted through

These are all statistics questions: Please show work in excel so that I can see how you got your answer and apply to other problems 3. Sales volume last weekend for four samples, each consisting of ve car dealerships, were as fellows: What is le mean of the distribution of sample means? Please round your answer to the nearest tenth. Note that the
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1 This assignment relates to the following Course Learning Requirements: [CLR 1] Calculate the chance that some specific event will occur at some future time knowledge of the normal probability distribution [CLR 2] Perform Sampling Distribution and Estimation [CLR 3] Conduct Hypothesis Testing [CLR 4] Understand and calculate Regression and

Hi, I have tried this several times and I just want to check my answer. \f
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The five-number summary below shows the grade distribution of a STAT 200 quiz for a sample of 200 students Answer each question based on the given information, and explain your answer in each case. \f
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How do I figure out the weight in a statistics chart?

Suppose that you are conducting a two tailed test about a proportion at the 0.01 level of significance. The correct critical value(s) to be used in drawing a conclusion is (are) -1.6451.962.5751.961.645

we want to a two-sided hypothesis test with a thresold of 3.4%. what is the critical value (give the absolute value?)

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A researcher is testing the effect of a new cold and flu medication on mental alertness.A sample of n = 9 college students is obtained and each student is given the normal dose of the medicine.Thirty minutes later, each student's performance is measured on a video game that requires careful attention and quick decision making.The scores for the

In this Assignment, you will be evaluating dimensions of quality in healthcare and how various industries can apply these concepts to improve operations. Using the resources available to you, research the priorities in the current publication of the National Quality Strategy. Kaplan University School of Health Sciences Unit 2 Assignment

A distribution has a standard deviation of o=10 find the z-score for each of the following locations in a distribution . a. above the mean by 5 points. b. above the mean by 2 points. c. below the mean by 20 points. d. below the mean by 15 points.

how do i identify a statistical test if i need to state the null and alternative hypothesis?

In a random sample of 19 people, the mean commute time to work was 32.1 minutes and the standard deviation was 7.3 minutes. Assume the population is normally distributed and use a t-distribution to construct a 98% confidence interval for the population mean . What is the margin of error of ? Interpret the results. The confidence interval for the

Need solution for these four exercises. These questionnaire related to topology and analysis. Exercise 1 Let A C R be a nonempty and bounded subset of IR. Prove that. sup A e I. Here, IR is equipped with its usual distance. Exercise 2 Let (X ,a'.) be a metric space and let A C X be a nonempty subset. 1. Prove that if 0 is an open set satisfying A
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The heights of adult males are normally distributed with a mean of 75 inches and a standard deviation of 3.5 inches. 19.What symmetric interval about the mean will contain approximately 68% of the heights? A.71.5 to 78.5 B.65.5 to 73.5 C.68 to 82 D. 64.5 to 85.5 20.What is the probability of randomly selecting 1 male whose average height is at

Title AaBb AaBbCcDdE Heading 2 NOON Activities Number of AaBbCcDo Heading 1 Well- Do to being AaBbCcDdEe No Spacing Save the data file to a location of your choice. Name the file Nursing home ds Enter the data in SPSS and perform the appropriate analyses to answer cach greater levels of well-being), and the number of activities they engage in each
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A. In the following correlation matrix, if DVAR were regressed on VARA, VARB, and VARC, what is the lowest possible value of R2? VARA 1.00 .62 .77 .54 VARA VARB VARC DVAR VARB VARC DVAR 1.00 .68 .36 1.00 .48 1.00 B. In the following correlation matrix, if DVAR is regressed on VARA, VARB, and VARC simultaneously, is there a problem? What problem?

It is estimated that 20% of luxury cars manufactured in 2008 were silver. A car dealership typically sells 20 luxury cars per month. a.What is the probability that 8 of the luxury cars sold per month are silver? b.What is the probability that more than 10 of the luxury cars sold per month are silver? c.How many silver luxury cars would you expect

STAT 200 Final Examination Fall 2017 OL1 Page 1 of 10 STAT 200 Introduction to Statistics Name______________________________ Final Examination: Fall 2017 OL1/US1 Instructor __________________________ Answer Sheet Instructions: This is an open-book exam. You may refer to your text and other course materials as you work on the exam, and you may use

1. The picture displays the fitted 3-predictor multiple regression model that was chosen using all three stepwise approaches. It is unnecessary to add interaction variables into the model displayed in the picture because: A: an influemce analysis indicated that there were no observations that undult influenced the fitted model. B: the dummy
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(a) For the typing experiment considered in Section 1.3 (Unit 1 slides, page 14), use a statistical model to quantify the gains from using randomization (second sequence in Unit 1, page 14) and from using balance in addition to randomization. (b) Suppose that the following sequence is obtained from using balanced randomization: 1. A, B2. A, B, 3.

MESSAGE MY INSTRUCTOR FULL SCREEN PRINTER WE am uzxry (Was ms, Sectima ee, Problem OS!) Fm Auto Service provides oil and lube service for cars. It is known that the mean time taken for oil and lube service at this garage is 15 minutes per car and me me deviation is 2-4 minutes. The management wants to promote the business by guaranteeing a maximum

Amulti-state lottery advertises the prizes and probabilities of winning shown in the accompanying table for a single$1 ticket. The jackpot isvariable, but assume it has an average of$3 million. Note that the same prize can be given to two outcomes with different probabilities. What is the expected value of a single lotteryticket? If you spend$365

In a game of four-handed Hearts, all 52 cards of a standard deck are dealt, so that each player starts each round with 13 cards in a hand. Suppose player A's hand has three clubs, six diamonds, two hearts, and two spades. What is the relative frequency of spades, rounded to two decimal places, dealt to player A?

One. Suppose you are interested in the behaviors of physicians that have high ratings of patient satisfaction. The research goal is to identify the behaviors in the natural clinical settings of these successful physicians so that these behaviors can be built into the curricula of medical preparation programs. The main data were collected by the

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7.36 - Height and the z distribution, question 1: Elena,a 15year-old girl, is 58 inches tall. The Centers for Disease Control (CDC) indicate that the average height for girls at this age is 63.80 inches, with a standard deviation of 2.66 inches Calculate Elenas z-score What percentage of his are taller? What percentage off girls are shorter? How

A simple random sample of 400 individuals provides 200 Yes responses a. What is the point estimate of the proportion of the population that would provide Yes responses (to 2 decimals)? b. What is your estimate of the standard error of the proportion (to 4 decimals)? c. Compute the 95% confidence interval for the population proportion (to 4

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