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Question: To try to understand the reason for returned goods, the manager of a store examines the records on 40 products that were returned in the last year. Reasons were coded by 1 for "defective," 2 for "unsatisfactory," and 0 for all other reasons, with the results shown in the table.
a. Give a point estimate of the proportion of all returns that are because of something wrong with the product, that is, either defective or performed unsatisfactorily.
b. Assuming that the sample is sufficiently large, construct an 80% confidence interval for the proportion of all returns that are because of something wrong with the product.
1.college students average 8.6 hours of sleep per night with a standard deviation of 35 minutes. if the amount of sleep
Many health professionals recommend that women practice monthly breast self-examination (BSE) to detect breast cancer in its early stages.
Scores by women on the SAT-I test are normally distributed with a mean of 998 and a standard deviation of 202. Scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6.
How does the sample size influence the extent to which the sample data can be used to accurately estimate population parameters?
What is the mean and standard deviation of the sampling distribution when we take all samples of size25?
The file "flowers.csv" contains information on measurements of the iris flowers. The file can be found here: flowers.csv. Create an R data frame by the name "flower.data" that contains the data in the file.
Using symbols state hypotheses (H 0 and H 1 ) for two-tailed test. Sketch suitable distribution and locate critical region for a = 0.05.
Angela complains that the problems on the algebra test were too hard. But have you ever seen the way Angela flirts with that good-looking quarterback.
Is the number of games won by a major league baseball team in a season related to the team's batting average? The information in the table, extracted from Sports Illustrated and Sporting News, shows the number of games won and the batting aver..
Quart cartons of milk should contain at least 32 ounces. A sample of 20 cartons contained the following amounts in ounces. Does sufficient evidence exist to conclude the mean amount of milk in cartons is less than 32 ounces at the 5% significance ..
Give a proof by cases that for integers m,n, we have |mn| = |m||n|. Hint: Consider four cases: (1) m ≥ 0 and n ≥ 0, (2) m ≥ 0 and n
Manufacturing and Product Development Eyedrops are used by many people to soothe and relieve irritation and to lubricate their eyes. A manufacturer claims.
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