Z and T Functions in Excel Standard Normal Distribution (Z) Finding
... picture of a well-known athlete, will increase product sales in supermarkets by an average of 50 cases in a week. For a random sample of 20 supermarkets, the average sales increase was 41.3 cases and the sample standard deviation was 12.2 cases. Test at the 5% level the null hypothesis that the popu ...
... picture of a well-known athlete, will increase product sales in supermarkets by an average of 50 cases in a week. For a random sample of 20 supermarkets, the average sales increase was 41.3 cases and the sample standard deviation was 12.2 cases. Test at the 5% level the null hypothesis that the popu ...
sample
... if the average meets national standards. Compare vitamin content of bread immediately after baking versus 3 days later (same loaves are used on day one and 3 days later) Compare vitamin content of bread immediately after baking versus loaves that have been on shelf ...
... if the average meets national standards. Compare vitamin content of bread immediately after baking versus 3 days later (same loaves are used on day one and 3 days later) Compare vitamin content of bread immediately after baking versus loaves that have been on shelf ...
INFERENTIAL STATISTICS
... Interestingly, it is the absolute size of the sample rather than the ratio of sample size to population size, that most affects sampling error. If you don’t have a population standard error, you rely on a best estimate—the standard deviation of the sample. THE LOGIC OF HYPOTHESIS TESTING—AKA Six ste ...
... Interestingly, it is the absolute size of the sample rather than the ratio of sample size to population size, that most affects sampling error. If you don’t have a population standard error, you rely on a best estimate—the standard deviation of the sample. THE LOGIC OF HYPOTHESIS TESTING—AKA Six ste ...
Lecture 4
... and finds the means to be $68 and $122 • Since difference is large, he draws another 38 samples of 75 each • The mean of means of the 40 samples turns out to be $ 94.85 • How confident should he be of this mean of means? ...
... and finds the means to be $68 and $122 • Since difference is large, he draws another 38 samples of 75 each • The mean of means of the 40 samples turns out to be $ 94.85 • How confident should he be of this mean of means? ...
