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Time spent using email per session is normally distributed with μ = 8 minutes and σ = 2 minutes.
a) What is the probability that the sample mean is between 7.8 and 8.2 minutes?
b) What is the probability that the sample mean is between 7.5 and 8 minutes?
c) If you select a random sample of 100 sessions, what is the probability that the sample mean is between 7.8 and 8.2 minutes?
In comparing two variances below, determine test value and what are degrees of freedom that must be used?
What are the endpoints of a 95 percent confidence interval for the proportion defective. (Round your answers to 3 decimal places).
According to the Sleep Foundation, the average night's sleep is 6.8 hours. Assume the standard deviation is 0.6 hours and the probability distribution is normal. a. What is the probability that a randomly selected person sleeps more than 8 hours?
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
Two independent samples of sizes n1 = 50 and n2 = 50 are randomly selected from two populations to test the difference between the population means. The sampling distribution of the sample mean difference, is:
At the .01 level of significance, is the mean grade of the female students higher than that of the males?
Assuming that these are a random sample of all publicly traded companies, construct a 95 % confidence interval for the overall noncompliance proportion.
If 900 users visited the site, would the probability that more than 250 of them click on an ad be higher or lower than the answer found in part
What is the appropriate conclusion based on the outcome of the hypothesis test?
What is the probability that a randomly selected tire will have a life of at least 30,000 miles?
Suppose the manufacturers claim is right, determine the probability the mean of sample is 47,840 miles or less?
At a = 0.05, can you reject claim that at least 52% of adults are more probable to purchase a product when there are free samples?
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