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A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who live in the California and finds that the number who exercise regularly is 31 out of 120.
a) What is X2obt?
b) What is df for this test?
c) What is X2cv?
d) What conclusion should be drawn from these results?
Assume that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 will be hearts.
How many of these new cardholders would you expect to default? What is the standard deviation?
A physician wanted to estimate the mean length of time µ that a patient had to wait to see him after arriving at the office.
Describe your answer to a person who has never had a course in statistics.
Roger has read a report that the weights of adult mail Siberian tigers have a distribution which is approximately normal with mean μ = 390 lb and σ = 65 lb
Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
Calculate a 95% confidence interval for the population mean, based on the sample 10, 12, 13, 14, 15, 16, and 49.
When a sample mean is greater than the true, population mean, the resulting difference is called:
In fitting the simple linear regression model Yi ~ N (α + β xi, σ 2 ) to the following data:
In a study of the consumer's view of the economy, the probability that a consumer would buy a house during the year was 0.0013, and the probability that the consumer would buy a car during the year was 0.198. There was also a 0.0100 probability t..
Describe the effect of an outlier or extreme value on the confidence interval - Find the probability that the return for common stocks
Determine the chance between 39% and 41% of registered voters in sample are Democrats.
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