From a random sample of 55 businesses, it is found that the mean time that employees spend on personal issues each week is 4.9 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amount of time spent on personal issues? (4.81, 4.99) (4.83, 4.97) (4.84, 4.96) (4.82, 4.98) […]
A manufacturer claims that their calculators are 6.800 inches long. A random sample of 55 of their calculators finds they have a mean of 6.812 inches with a population standard deviation of 0.05 inches. At α=0.08, can you support the manufacturer’s claim using the p value? a Claim is the alternative, reject the null and […]
In a situation where the population standard deviation was known rather than the sample standard deviation, what would be the impact on the confidence interval? It would remain the same as standard deviation does not impact confidence intervals It would become wider due to using the z distribution It would become narrower with fewer values […]
In a sample of 8 high school students, they spent an average of 28.8 hours each week doing sports with a sample standard deviation of 3.2 hours. Find the 95% confidence interval, assuming the times are normally distributed. (26.12, 31.48) (22.47, 35.21) (25.62, 32.48) (24.10, 34.50) (CO6) In a sample of 15 stuffed animals, you […]
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