New Semester Started
Get
50% OFF
Study Help!
--h --m --s
Claim Now
Question Answers
Textbooks
Find textbooks, questions and answers
Oops, something went wrong!
Change your search query and then try again
S
Books
FREE
Study Help
Expert Questions
Accounting
General Management
Mathematics
Finance
Organizational Behaviour
Law
Physics
Operating System
Management Leadership
Sociology
Programming
Marketing
Database
Computer Network
Economics
Textbooks Solutions
Accounting
Managerial Accounting
Management Leadership
Cost Accounting
Statistics
Business Law
Corporate Finance
Finance
Economics
Auditing
Tutors
Online Tutors
Find a Tutor
Hire a Tutor
Become a Tutor
AI Tutor
AI Study Planner
NEW
Sell Books
Search
Search
Sign In
Register
study help
business
probability statistics
Using And Interpreting Statistics 3rd Edition Eric W. Corty - Solutions
If N = 18, M = 12, μ = 10, and s = 1, what is t? (p. 18)
If M = 8, μ = 6, and sM = 0.68, what is t?
If M = 10, μ = 12, and sM = 1.25, what is t? (p. 18)
If N = 44 and s = 7, calculate sM. (p. 18)
An SAT-tutoring company claims that its students perform above the national average on SAT subtests. If the national average on SAT subtests is 500 and the tutoring company obtains SAT scores from a random sample of 626 of its students, write the null and alternative hypotheses.
days. An infectious disease physician has developed a treatment that he believes will treat the flu more quickly. Write the null and alternative hypotheses.
In America, the average length of time the flu lasts is
A researcher wants to compare a random sample of left-handed people in terms of IQ to the population mean of IQ. Given M = 108 and assuming μ = 100, write the null and alternative hypotheses.
The population mean on a test of paranoia is 25. A psychologist obtained a random sample of nuns and found M = 22. Write the null and alternative hypotheses.
There is a random sample of students from a large public high school. Each person, individually, takes a paper-and-pencil measure of introversion. (a) Check the assumptions and decide whether it is OK to proceed with a single-sample t test to compare the sample mean to the population mean of
A researcher wants to compare the mean weight of a convenience sample of students from a college to the national mean weight of 18-to 22-year-olds. (a) Check the assumptions and decide whether it is OK to proceed with a single-sample t test. (b) Can the researcher generalize the results to all the
d and r 2 should lead to similar conclusions about the size of an effect. Though both may have been calculated, it is ___ to report both.
r 2 measures how much variability in the ___. is explained by the ___.
To ___ a study is to repeat it.
When one fails to reject the null hypothesis, one should ___ calculate Cohen’sd. (p. 18)
As the effect size d increases, the degree of overlap between the distributions for two populations ___. (p. 18)
A value of 0 for Cohen’s d means that the independent variable had ___impact on the dependent variable. (p. 18)
APA format uses the inequality ___ to indicate that the null hypothesis was not rejected when α = .05. (p. 18)
If one fails to reject the null hypothesis, one can say that there is ___ to conclude a difference exists between the population means. (p. 18)
If a result is reported in APA format as p < .05, that means the observed value of the test statistic fell in the ___zone.
APA format uses the inequality ___to indicate that the null hypothesis was rejected when α = .05.
Sample size is reported in APA format for a single-sample t test by reporting ___.
To determine the direction of a statistically significant difference, compare the ___ to the ___. (p. 18)
If the null hypothesis is rejected, it is concluded that the mean for the population the ___ came from differs from the hypothesized value. (p. 18)
For the second interpretation question, one calculates___, and for the third, one calculates a___.
For a two-tailed, single-sample t test, the null hypothesis is rejected if t ≤ ___or if t ≥ ___.
Determining the critical value depends on (a) how many___the test has, (b) how willing one is to make a Type___error, and (c) the ___.
In order to write the null and alternative hypotheses for a singlesample t test, the researcher needs to know whether the test has one or two___.
If a___assumption is violated, a researcher can still proceed with the test as long as the violation is not too great. (p. 18)
The third assumption of the single-sample t test is called the___assumption for short. (p. 18)
A second assumption of the single-sample t test is that observations within the sample are___. (p. 18)
The population that the sample comes from determines the population to which the results can be___. (p. 18)
One assumption of the single-sample t test is that the sample is a random sample from the population. This is / is not robust to violation. (p. 18)
Tom___Harry___ ___infants. (p. 18)
A sample, selected at random from a population, may have a sample mean that differs from the population mean due to___. (p. 18)
In order to use a single-sample t test, one does / does not need to know the population standard deviation. (p. 18)
A college president has obtained a sample of 81 students at her school. She plans to survey them regarding some potential changes in academic policies. But, first, she wants to make sure that the sample is representative of the school in terms of academic performance. She knows from the registrar
If M = 55, μ = 50, tcv = ±2.052, and sM = 1.89, what is the 95%confidence interval for the difference between population means?
If M = 70, μ = 60, tcv = ±2.086, and sM = 4.36, what is the 95%confidence interval for the difference between population means?
If r = .32, how much of the variability in the outcome variable, Y, is accounted for by the explanatory variable, X?
If N = 18 and t = 2.37, what is r 2?
If M = 93, μ = 100, and s = 30, what is d ?
If M = 66, μ = 50, and s = 10, what is d? (p. 18)
If N = 340 and t = 3.678, write the results in APA format. (p. 18)
If N = 36 and t = 2.030, write the results in APA format.
If N = 7 and t = 2.309, write the results in APA format.
If N = 19 and t = 2.231, write the results in APA format.
If M = 24, μ = 30, and sM = 8, what is t?
If N = 17 and s = 6, what is sM?
A researcher has drawn a random sample of 48 cases from a population. He plans to use a single-sample t test to compare the sample mean to the population mean. He has set a at .05 and is doing a two-tailed test. Write out the decision rule regarding the null hypothesis. (p. 18)
A researcher has a sample of Nobel Prize winners. She thinks that they may be smarter than average. If the average IQ is 100, what are the null and alternative hypotheses for a single-sample t test?
Which rare zone is larger if the observed difference is in the expected direction—for a one-tailed test or a two-tailed test? (p. 18)
What are the assumptions for a single-sample t test? (p. 18)
When should a single-sample t test be used?
What are the six steps to be followed in conducting a hypothesis test?(p. 18)
A researcher draws a sample from a population and finds that the sample mean is different from what he thought the population mean was. One explanation for the discrepancy is that he was wrong about what the population mean is. What’s another explanation for the discrepancy?
The population of random, two-digit numbers ranges from 00 to 99, has µ = 49.50 and σ = 28.87. A statistician takes a random sample from this population and wants to see if his sample is representative. He figures that if it is representative, the sample mean will be close to 49.50. He plans to
A lightbulb manufacturer believes that her compact fluorescent bulbs last longer than incandescent bulbs. She knows that the mean number of hours is 2,350 hours for a 60-watt incandescent bulb, with a standard deviation of 130 hours (these are population values). She gets a random sample of her
A health science researcher believes that athletes have a lower resting heart rate than the general population. He knows, for the general population, that µ = 78 and σ = 9. He is planning to do a study in which he obtains a random sample of athletes, measures their resting heart rates, and uses a
A researcher is testing the null hypothesis that µ = 120, with σM =20. In reality, the population mean is 140. (a) Draw a figure like Figure 6.12. Designate in the figure the areas representing Type II error and power. (b) Does one need to worry about Type I error?
A researcher is testing the null hypothesis that µ = 35. She is doing a two-tailed test, has set alpha at .05, and has 121 cases in her sample. What is beta?(p. 18)
Noncontaminated food is tested and it is called “contaminated.”(p. 18)
Noncontaminated food is tested and it is called “noncontaminated.”(p. 18)
(a) µ0 = −17, µ1 = −23; (b) µ0 = −17; µ1 = −18
(a) µ0 = 10, µ1 = 15; (b) µ0 = 10, µ1 = 20
(a) β = .30; (b) power = .50
(a) β = .60; (b) power = .60
At a large state university, the population data show that the average number of times that students meet with their academic advisors is 4.2 with α = 1.8. The dean of student activities at this university wondered what the relation was between being involved in student clubs and organizations
A dietitian wondered if being on a diet was related to sodium intake.She knew that the mean daily sodium intake in the United States was 3,400 mg, with a standard deviation of 270. She obtained a random sample of 172 dieting Americans and found, for sodium consumption, M = 2,900 mg. Complete all
If power = .90, β = _____. (p. 18)
If β = .75, power = _____. (p. 18)
A Verizon researcher compared the number of text messages sent by a sample of teenage boys to the population mean for all Verizon users. She found no evidence to conclude that there was a difference.Unfortunately, her conclusion was in error. (a) What type of error did she make? (b) What conclusion
A journalist was comparing the horsepower of a sample of contemporary American cars to the population value of horsepower for American cars of the 1970s. He concluded that there was a statistically significant difference, such that contemporary cars had more horsepower. Unfortunately, his
In the population of children in a school district, the mean number of days tardy per year is 2.8. A sociologist obtained a sample of children from single-parent families and found the mean number of days tardy was 3.2. He used a single-sample z test to analyze the data, finding z (N = 28) = 1.68,
A researcher obtained a sample of 123 American women who said they wanted to lose weight. She weighed each of them and found M= 178 pounds. The mean weight for women in the United States is 164 pounds and the population standard deviation is known. The researcher used a single-sample z test and
M = 20, µ = 24, and the results were reported in APA format as p >.05. (a) Was there a statistically significant difference between the sample mean and the population mean? (b) What was the direction of the difference?
M = 16, µ = 11, and the results were reported in APA format as p
Given N = 87 and z = −1.96, (a) decide if the null hypothesis was rejected, and (b) report the results in APA format. Use α = .05, twotailed.
Given N = 23 and z = 2.37, (a) decide if the null hypothesis was rejected, and (b) report the results in APA format. Use α = .05, two-tailed.
Use the following information to calculate (a) σM and (b) z. M = 15,µ = 21, σ = 1.5, and N = 63
Use the following information to calculate (a) σM and (b) z. M = 12,µ = 10, σ = 5, and N = 28. (p. 18)
Calculate z for M = 97, µ = 85, and σM = 4.5. (p. 18)
Calculate z for M = 100, µ = 120, and σM = 17.5.
Calculate σM using the data from Exercise 6.78.
Calculate σM using the data from Exercise 6.77.
State the decision rule for Exercise 6.78.
State the decision rule for Exercise 6.77.
List the null and alternative hypotheses for Exercise 6.78.
List the null and alternative hypotheses for Exercise 6.77.
A Veterans Administration researcher has developed a test that is meant to predict combat soldiers’ vulnerability to developing posttraumatic stress disorder (PTSD). She has developed the test so thatµ = 45 and σ = 15. She is curious if victims of violent crime are as much at risk for PTSD as
A researcher has a first-grade readiness test that is administered to kindergarten students and scored at the interval level. The population mean is 60, with a standard deviation of 10. He has administered it, individually, to a random sample of 58 kindergarten students in a city, M = 66, and wants
The mean vacancy rate for apartment rentals in the United States is 10%, with a standard deviation of 4.6. An urban studies major obtained a sample of 15 rustbelt cities and found that the mean vacancy rate was 13.3%. What statistical test should she use to see if the mean vacancy rate for these
A scientific supply company has developed a new breed of lab rat, which it claims weighs the same as the classic white rat. The population mean (and standard deviation) for the classic white rat is 485 grams (50 grams). A researcher obtained a sample of 76 of the new breed of rats, weighed them,
If one makes a Type I error or a Type II error, then the conclusion about the _____ is wrong. (p. 18)
1.00 = _____ + power.
Power is the probability of rejecting the null hypothesis when _____. (p. 18)
As the size of the effect increases, the probability of Type II error _____. (p. 18)
If one fails to reject the null hypothesis, one needs to worry about _____ error but not _____ error. (p. 18)
The probability of Type II error is commonly set at _____. (p. 18)
The probability of Type I error is usually set at _____. (p. 18)
Showing 8000 - 8100
of 8686
First
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
Step by Step Answers
Get 50% OFF
Study Help!
Claim Now
