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.)
How many times should a coin be tossed to obtain a probability of equal to or greater than 0.9 of observing at least one head?
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).
Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,225 per hour and a standard deviation of $275.
How is the rejection region defined and how is that related to the zscore and p value?
what requirements are necessary for a normal probability distribution to be a standard normal probability distribution?
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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