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With reference to Exercise 38, what can we say with 99% confidence about the maximum error if we use the observed sample proportion as an estimate of the proportion of all shoppers in the population sampled who use coupons?
Exercise 38
A sample survey at a supermarket showed that 204 of 300 shoppers regularly use coupons. Use the large sample confidence-interval formula of Theorem 6 to construct a 95% confidence interval for the corresponding true proportion.
a recent study of robberies for a certain geographic area showed an average of 1 robbery per 20000 people. in a city of
A researcher is using a chi-square test to determine whether there are any preferences among four brands of cola. With alpha = .05 and a sample of n = 30, what is the boundary for the critical region for the hypothesis test.
suppose the results of the analyses in problem 15-17 are reported and criticized because the participants were not
2. The staff at a local psychiatric facility wants to determine whether implementing a No Smoking rule significantly decreases the length of stay of inpatients.
About 10% of all adults deliberately do a one-time fling and feel no guilt about it. In a group of 7 adult friends, what is the probability that: No one has done a one-time fling.
Determine the appropriate statistical tool to test the hypothesis based on the research question - conduct a hypothesis test with a 95% confidence level, using the statistical tool.
A fair coin is tossed four times and X is number of heads on first three tosses and Y on last three. What is the joint probability mass function of x and y? What is the marginal pmf? Are X and Y independent?
1. in a random sample of 24 people the mean number of books they had read in the past year was 11.22 books and the
q1. both undergraduates and postgraduates can use the university cafeteria. each diner can choose between buying a
Some food retailers propose subjecting food to a low level of radiation in order to improve safety, but sale of such "irradiated" food is opposed by many people. Suppose a grocer wants to find out what his customers think.
Let x be a random variable that represents a braking distance. Find the probability that a randomly selected braking distance is less than 49 meters.
serum ferritin is used in diagnosing iron deficiency. in a study conducted recently researchers discovered that in a
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