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mathematics
introduction to business statistics

Questions and Answers of Introduction to business statistics

Can a study have both random sampling and random assignment? If so, explain what can be determined from such a study if statistical significance is found.
Researchers could design an experiment where there is a balance with respect to the sex of the subjects between two experimental groups by putting half the females in one group and half in the other
Does random assignment always equally balance all the variables (except for the explanatory variable) between experimental groups? Is there a tendency for there to be a balance? Explain.
From which of the following studies can cause-and effect conclusions potentially be drawn? If cause and effect can be determined, explain what may cause what.a. From a random sample of city
From which of the following studies can cause and- effect conclusions potentially be drawn? If cause and effect can be determined, explain what may cause what.a. Subjects were randomly assigned to
What is the difference between random sampling and random assignment and what types of conclusions can be drawn from each?
Many studies have shown that babies born to women who smoked while pregnant tended to weigh less at birth than babies born to mothers who did not smoke while pregnant.a. Are these studies
Refer to the information provided in the previous question. While it’s possible in principle to conduct a randomized experiment to investigate this issue, it would be unethical to do so. Explain
Many studies have surveyed mothers and fathers about their behaviors (diet, health, etc.) at or immediately before the time of the conception of their baby in an attempt to find connections between
Many studies have found that children who listen to classical music while in the womb or when younger tend to have higher IQs later in life. These studies are typically done by surveying parents of
Is the sex of a person making a friend request on Facebook to someone they do not know associated with whether or not the request is accepted? To answer this question, student researchers at Hope
Are cuteness and aggression related? A study done at Yale University tested this by showing people pictures of cute animals (like kittens and puppies) or pictures of older more serious looking
A research article, “Power Posing: Brief Nonverbal Displays Aff ect Neuroendocrine Levels and Risk Tolerance,” published in Psychological Science, September 2010, describes a study involving 42
Students recruited at the cafeteria at Hope College were blindly given a single Skittles® candy to put in their mouth. They were told the five possible flavors and then were asked which flavor they
Read FAQ 4.2.1 that discusses randomness and its implications and answer the following.a. The FAQ discusses how the determination that smoking causes cancer was obtained from studies that did not
When can you legitimately draw a cause-and effect conclusion from a randomized experiment?A. When the p-value is smallB. When the p-value is largeC. Always, regardless of the p-valueD. Never,
Answer the following questions about explanatory and response variables.a. Must an explanatory variable always be categorical?b. Must a response variable always be quantitative?
In a recent study of animal-assisted therapy (Cole et al., 2007), researchers investigated whether patients hospitalized with heart failure could be helped by a visit from a dog. Th e 76 patients in
In a study conducted in New Zealand, researchers Parkin et al. randomly assigned volunteers to wear either socks over their shoes (intervention) or their usual footwear (control) as they walked
In a randomized, double-blind study reported in the Journal of American Medical Association, researchers Waber et al. (2008) administered a pill to each of 82 healthy paid volunteers from Boston,
Narrower confidence intervals are better than wider confidence intervals. One way to achieve a narrower confidence interval is to use a smaller confidence level. So, why do statisticians not always
Narrower confidence intervals are better than wider confidence intervals. One way to achieve a narrower confidence interval is to use a larger sample size. So, why do statisticians interested in
Higher confidence is better than lower confidence. So, why do statisticians not always use 99.99% confidence intervals?
A national survey of 47,000 American households in 2006 found that 32.4% of the households included a pet cat. Th is survey result was reported in the 2011 Statistical Abstract of the United States,
The Harris polling organization conducted a national survey in 2008, finding that 14% of the sample of 2,302 American adults had a tattoo.a. Use the Theory-Based Inference applet to determine a 99%
Use the data described in the previous exercise to answer the following questions:a. Investigate your answer to 3.CE.8, part (b), by using the Theory-Based Inference applet to test the following
Do Americans believe that the United States has a unique character that makes it the greatest country in the world? Th is belief has been called “American exceptionalism.” A Gallup poll conducted
Suppose that researchers in three different countries collect sample data on whether or not a person has donated blood within the past year, with the following sample results:A. 200 blood donors in a
Suppose that researchers in three different countries collect sample data on whether or not a person has donated blood within the past year, with the following sample results:A. 200 blood donors in a
Recall that a margin of error for a 95% confidence interval for process probability can be approximated by the expression 1/ˆšn.a. Evaluate this expression (to three decimal places) for the
If the standard deviation were 1.25 hours instead of 1.05, the width of a 95% confidence interval would (increase/decrease).
If the standard deviation were 0.78 hours instead of 1.05, the width of a 95% confidence interval would (increase/decrease).
Which confidence interval would be the narrowest?A. 99% B. 95%C. 90% D. 85%
A confidence interval is constructed for the population mean hours studied. Which confidence interval would be the widest?A. 99% B. 95%C. 90% D. 85%
You have a coin that you think is fair, with π = probability of heads = 1/2.a. Rodgers has done 25 flips and plans to do another 25 flips. Hammerstein has done 100 flips and plans to do another 25
Ordinary dice have six equally likely sides. You can buy dice online with (A) 4 sides, (B) 6 sides, (C) 8 sides, or (D) 10 sides. Suppose you want to estimate the probability of rolling a 1 for each
You have an ordinary six-sided die, but you suspect it may be loaded. If the die is fair, then the probability of rolling a 6 equals 1/6.a. Let π = the probability of rolling a 6. To estimate π to
As n increases, the SD for p̂ ________________ (increases, decreases) more and more ______________ (slowly, quickly).
Gilbert uses a sample size of 25. Sullivan uses a sample size of 100. Gilbert’s estimated SD for p̂ will be ________ times as large as Sullivan’s.
Looking at the formula to calculate the SD of p̂, the “root n relationship” means that to cut the SD of p̂ in half, you need to:A. Multiply the sample size by 1/2B. Multiply the sample size by
A Gallup survey of 1001 randomly selected U.S. adults conducted May 2011 asked, “In your opinion, which one of the following is the main reason why students get education beyond high school?”
Refer to the previous exercise to answer the following questions:a. If the sample size had been 2,000, how would the widths of the 90%, 95%, and 99% confidence intervals be affected?b. If the sample
The 2011 Statistical Abstract of the United States includes a table reporting that a national survey in the fall of 2009 found that 11.6% of American adults had played a Sudoku puzzle in the past
Name three things that affect the margin of error in a theory-based confidence interval for a population mean, μ. Which of these three things is the hardest for an investigator to control?
Name three things that affect the margin of error in a theory-based confidence interval for a population proportion, π. Which of these three things is the hardest for an investigator to control?
Recall the form of a theory-based confidence interval for a population proportion π isp̂ ± multiplier × √p̂ (1 − p̂ / na. Increasing the confidence level has what effect, if any, on the
Recall the form of a theory-based confidence interval for a population proportion π is p̂ ± multiplier × √p̂ (1 − p̂) / n.a. Remind me: What’s the difference between p̂ and π?b.
Which method can only construct a 95% confidence interval?A. Range of plausible valuesB. 2 SDC. Theory-based one-proportion z-interval
Describe three different methods for constructing a confidence interval for a population proportion.
One of the questions asked of a random sample of adult Americans on the 2004 General Social Survey (GSS) was:From time to time, most people discuss important matters with other people. Looking back
How much do you typically pay, including tips, for a haircut? In a survey of 50 students in her class, one of the authors found the average amount paid for haircuts to be $45.68 and the standard
Data were collected on random specimens of Yellow fin tuna from 1991 and 2010. For the sample of 231 specimens of Yellowfi n tuna, the average mercury level was found to be 0.354 ppm and the standard
Data were collected on random specimens of tuna from 1991 and 2010. The mercury level for each fish specimen was recorded. For the sample of 43 specimens of Albacore tuna, the average mercury level
Two Cal Poly freshmen gathered data on the prices for a random sample of 30 textbooks from the campus bookstore. They found the average price was $65.02, and the standard deviation of prices was
Reconsider the previous question about number of Facebook friends. Using the data from the sample of 49 students, a 99% confidence interval for the average number of Facebook friends is found to be
In a survey of her introductory statistics class, an instructor found the average number of Facebook friends the 49 respondents had was 539.2 and the standard deviation was 298. The data on number of
Reconsider the investigation of the manufacturing process that is producing hypodermic needles. Using the data from the most recent sample of needles, a 90% confidence interval for the average
Reconsider the investigation of the manufacturing process that is producing hypodermic needles. Recall that the most recent random sample of 35 needles have an average diameter of 1.64 mm and a
Reconsider the investigation of the manufacturing process that is producing hypodermic needles. Recall that the most recent random sample of 35 needles have an average diameter of 1.64 mm and a
Consider a manufacturing process that is producing hypodermic needles that will be used for blood donations. These needles need to have a diameter of 1.65 mm—too big and they would hurt the donor
Reconsider the previous exercises about the average number of states all students at the author’s school have visited. Using the data from the author’s sample, a 99% confidence interval for the
Reconsider the previous exercises about the average number of states all students at the author’s school have visited. Recall that in the author’s sample of 50 students the average number of
Reconsider the previous question about the average number of states all students at the author’s school have visited. Recall that in the author’s sample of 50 students the average number of
In a pre course, anonymous survey of students in her introductory statistics course, one of the authors asked her students how many hours per week they expected to spend studying statistics outside
One of the authors came across an article (USA Today, 2008) that said that on average Americans have visited 16 states in the United States. In a survey of 50 students in her introductory statistics
As was explained in the previous question, the normal (or average) body temperature of humans is oft en thought to be 98.6° F. Is that number really the average? To test this, we will use a data set
Normal (or average) body temperature of humans is often thought to be 98.6° F. Is that number really the average? To test this, we will use a data set obtained from 65 healthy female volunteers aged
Most dermatologists recommend using sunscreens that have a Sun Protection Factor (SPF) of at least 30. One of the authors wanted to find out whether the SPF of sunscreens used by students at her
Here is a dotplot for the ages of 21 male rattlesnakes captured at a single site. Assume that these 21 snakes can be regarded as a random sample of all male rattlesnakes at that site. Th e average
Reconsider the previous question about hours spent watching TV every day. Suppose that the data had actually been collected from a sample of 150 students, and not 100, but everything else (mean and
According to a 2011 report by the United States Department of Labor, civilian Americans spend 2.75 hours per day watching television. A faculty researcher, Dr.Sameer, at California Polytechnic State
True or false? If you are concerned that the validity conditions aren’t met, use a theory-based approach to compute a confidence interval for the mean.
True or false? In general, there will be more variability in the sample means across samples than in the variability in the quantitative variable across observational units.
True or false? When using the 2SD method to find a 95% confidence interval for the mean, multiply the standard deviation of the quantitative variable by 2 to obtain the margin of error.
True or False? For 95% confidence intervals constructed from repeated samples from the same population, 95% of the intervals contain the parameter.
True or False? There is a 95% chance that the parameter is contained in a 95% confidence interval.
Match confidence interval terminology to the game of horseshoes.A. ParameterB. Confidence intervalC. Coverage probability1. horseshoe2. proportion of times horseshoe is around stake3. Stake
Using the simplified version for the margin of error from the previous exercise, 1/√n, determine the smallest sample size needed so the margin of error is:a. 0.06b. 0.03c. 0.01
Show that the margin-of-error formula 1.96√p̂ (1 − p̂)/n} simplifies to approximately 1/√n when p̂ = 0.5.
Based on the null distribution generated using the 1,000 simulated values of the statistic, what values would you consider typical values and what would you consider atypical values of the statistic?
How do the actual study results compare to the null distribution obtained when simulating assuming 0.10 of the population faked cell phone calls? Do you believe the study results provide convincing
Determine the approximate p-value from your simulation analysis. Also interpret what this p-value represents (i.e., the probability of what, assuming what?).
Now, let’s step back a bit and think about the scope of our inference. What are the wider implications? Do you think that your conclusion holds true for people in general? What is the broader
Summarize your findings. If you were to repeat this study, would you gather your sample in a different way? Are there things about the study you would change? What further research might you follow
Let π denote some population proportion of interest and suppose a 95% confidence interval for π is calculated to be (0.6, 0.7). Also, suppose that we want to testH0: π = 0.63 vs. Ha: π ≠
Let π denote some population proportion of interest and suppose a 99% confidence interval for π is calculated to be (0.60, 0.70). Also, suppose that we want to testH0: π = 0.74 vs.Ha: π ≠
Let π denote some population proportion of interest and suppose a 95% confidence interval for π is calculated to be (0.63, 0.73) and a 99% confidence interval for π is calculated to be (0.61,
Suppose I am conducting a test of significance where the null hypothesis is my cat Cayle will pick the correct cancer specimen 25% of the time and the alternative hypothesis is that she will pick the
Suppose I am conducting a test of significance where the null hypothesis is my cat Grayce will pick the correct cancer specimen 25% of the time and the alternative hypothesis is that she will pick
Suppose I am conducting a test of significance where the null hypothesis is my cat Cayce will pick the correct cancer specimen 25% of the time and the alternative hypothesis is that he will pick the
Tennis players oft en spin a racquet to decide who serves first. Th e spun racquet can land with the manufacturer’s label facing up or down. A reasonable question to investigate is whether a spun
When conducting a two-sided test of significance, the value of the parameter under the null hypothesis is plausible and will be contained in a 95% confidence interval when:A. The p-value is less than
When conducting a two-sided test of significance, the value of the parameter under the null hypothesis is not plausible and will not be contained in a 95% confidence interval when:A. The p-value is
We use confidence intervals to estimate the value of:A. The population proportionB. The sample proportionC. The p-valueD. The standard deviation
When we say that 0.50 is a plausible value for the population proportion, plausible means 0.50 will:A. Be in the 95% confidence intervalB. Not be in the 95% confidence interval
Suppose a 95% confidence interval is constructed from a sample proportion and 0.50 is contained in the interval. Which of the following are true?A. A 90% confidence interval constructed from the same
To determine a 95% confidence interval using the interval of plausible values method, what significance level should be used on the two-sided tests?
To determine a 99% confidence interval using the interval of plausible values method, what significance level should be used on the two-sided tests?
Based on an October 2013 Gallup poll, a 95% confidence interval for the proportion of American adults that think a degree from a well-respected university is more important for a young person to
Based on an August 2013 Gallup poll, a 95% confidence interval for the proportion of American adults that thought math was the most valuable subject they studied in school is 0.31 to 0.37. Explain

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