Determining the value for the new sample mean
A sample of n = 7 scores has a mean of M = 9. One score in the sample is changed from X = 19 to X = 5. What is the value for the new sample mean?
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For a population with µ= 40 and s = 7, find the -score for each of the following X values. (Note: You probably will need to use a formula and a calculator to find these values.)
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How many workers need to be sampled in order to estimate the population proportion of workers who worried about retiring comfortably to within +/- 0.02 with 95% confidence?
Suppose that we are testing H0: µ = µ0 versus H1: µ > µ0. Calculate the P -value for the following observed values of the test statistic (round all answers to 4 decimal places).
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How is the rejection region defined and how is that related to the zscore and p value?
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A time for the 100-meter spring of 15.1 seconds at a school where the mean time for the 100-meter sprint is 17.6 seconds and the standard deviation is 2.2 seconds. Find the z score corresponding to the given value and use the z score to determine
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