Dress Shirts In a previous study conducted several years ago, a man owned on average 14 dress shirts. The standard deviation of the population is 2. A researcher wishes to see if that average has changed. He selected a random sample of 44 men and found that the average number of dress shirts that they owned was 13.9. At α=0.05, is there enough evidence to support the claim that the average has changed? Assume that the variable is normally distributed. Use the P-value method with a graphing calculator. Find the P-value. Round the answer to at least four decimal places. P-value=
Dress Shirts In a previous study conducted several years ago, a man owned on average 14 dress shirts. The standard deviation of the population is 2. A researcher wishes to see if that average has changed. He selected a random sample of 44
men and found that the average number of dress shirts that they owned was
13.9. At α=0.05, is there enough evidence to support the claim that the average has changed? Assume that the variable is
P-value method with a graphing calculator.
Find the P-value. Round the answer to at least four decimal places.
P-value=
Student Expenditures The average expenditure per student (based on average daily attendance) for a certain school year was $10,337 with a population standard deviation of $1560. A survey for the next school year of 174 randomly selected students resulted in a sample mean of $10,547. Do these results indicate that the average expenditure has changed? Use α=0.05. Use a graphing calculator.
Find the P-value. Round the answer to at least four decimal places.
P-value=
Weight Loss of Newborns An obstetrician read that a newborn baby loses on average 7 ounces in the first two days of his or her life. He feels that in the hospital where he works, the average weight loss of a newborn baby is less than 7 ounces. A random sample of 33 newborn babies has a mean weight loss of 6.6 ounces. The population standard deviation is 1.8 ounces. Is there enough evidence at
α=0.05 to support his claim? Assume that the variable is normally distributed. Use the
P-value method with a graphing calculator.
P-value=
Daily Driving The average number of miles a person drives per day is
- 24. A researcher wishes to see if people over age 60 drive less than 24
miles per day. She selects a random sample of 32 drivers over the age of
60 and finds that the mean number of miles driven is 22.9. The population standard deviation is 3.1 miles. At α=0.05, is there sufficient evidence that those drivers over
60 years old drive less than 24 miles per day on average? Assume that the variable is normally distributed. Use the P-value method with a graphing calculator.
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