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You have been assigned the task of conducting a survey to study prescription medication purchases of adults.
a. If you want to estimate the percentage of adults who have purchased prescription medication during the past 30 days, how many adults must you survey if you want 95% confidence that your percentage has a margin of error of three percentage points?
b. If you want to estimate the mean amount that adults have spent on prescription medication during the past 30 days, how many adults must you survey if you want 95% confidence that your sample mean is in error by no more than %5? (based on results from a pilot study, assume that the standard deviation of amounts spent on prescription medications in the past 30 days is $39.)
c. If you plan to obtain the estimates described in parts (a) and (b) with a single survey having several questions, how many adults must be surveyed?
What is Mr. Cheek's blood pressure? Carry your intermediate computations to at least four decimal places.
Suppose the college in question 12 has only graduated 10,000 students. Construct a 96 percent confidence interval for the mean time required for all graduates to earn a bachelor's degree.
Statistical questions tend to fall into what two main categories?
Without doing any calculation, indicate whether the mean of the children's age in the next 15 years will be larger, smaller, or the same as the mean.
The morning arrival times for 10 days of a school bus at the Tipperary street pickup stop are 8:05, 8:06, 8:09, 8:12, 8:03, 8:15, 8:11, 8:16, 8:00, and 8:14.
Twenty-six newborn baby boys are weighed and measured for length. The standard deviation of weight is 2 lb, but usual linear regression techniques
q1.a researcher in the west coast of the u.s. wants to estimate the amount of a newly discovered antibody in human
Give an example of a problem (business, political, scientific) in which ANOVA analysis would be appropriate. (Hint: the dependent variable is categorical, such as male vs. female or comparing three different types of fertilizer.)
Draw a bar chart of the percents found in parts (b) and (c) to show the relationship between the letter listed first and the letter picked.- Explain whether or not you think the letter listed first in the question affected the choice of letter.
Assume the proposed projects can be abandoned at any time without penalty. Which of the following statements is CORRECT?
in the telephone survey technique introduced in exercise 6.5 what is the probability of two or fewer successful calls
Which combination of factors produces smallest risk of Type I error?
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