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A sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia.
The data obtained is shown in the table below.
Africa:Sample mean 55.3,Population standard deviation 8.1, sample size 53
Asia: Sample mean 65.3, Population standard deviation 9.3, sample size 42
Calculate the critical value. Use a=0.05
a) 2.33
b) 2.58
c) 1.96
d) 1.65
SAT Math scores have a bell-shaped distribution with a mean of 515 and a standard deviation of 116. a) what percentage of SAT scores are between 399 and 631?
which is a value often used for the upper limit of the range of normal values. What do the results suggest about the sample group?
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 20 hours, with a standard deviation of 5.5 hours
The Warren County Telephone Company claims in its annual report that "the typical customer spends $70 per month on local and long-distance service.
A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 99% confident that her estimate is correct.
You are given the sample mean and the sample deviation, Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider?
If student is chosen at random, determine the probability that he or she is sophomore and owns a credit card.
The ages of cars owned by all employees of a large company have a bell shaped distribution with a mean of 8 years and a standard deviation of 2 years. Using the empirical rule, find the approx. percentage of cars (owned by those employees) that are b..
Pollsters try to determine whether or not a person is a "likely voter" before they count their opinion in a poll. If we assume 40% of the registered voters will actually vote, in a random sample of 100 registered voters we can be 95% confident tha..
State the hypothesis test (with the formula of test statistic) could be used to see if the show-up ratio of people booked tickets is larger than 0.7.
Decision making under risk is the same as decision making under uncertainty because in both the probabilities are unknown.
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
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