Given the following sampling distribution of one mean with a sample size 25, from a normally distributed population, find the population standard deviation, a. 54 56 58 60 62 64 66

A population N=5 consists of the following values 13, 15, 17, 19, and 21. Random Sample of size n=3 are taken. Calculate the variance of the sampling distribution of the sample mean. 1.87 1.73 2.67 1.33 Other:

Consider a data set containing the following values: 92 84 85 93 95 89 86 91   The mean of the preceding values is 89.375. The deviations from the mean have been calculated as follows: 2.625 –5.375 –4.375 3.625 5.625 –0.375 –3.375 1.625   If this is sample data, the sample variance is     and the sample standard deviation is    .   If this is population data, the population variance is     and the population standard deviation is    .   Suppose the largest value of 95 in the data was misrecorded as 93. If you were to recalculate the variance and standard deviation with the 93 instead of the 95, your new values for the variance and standard deviation would be    .

Calculate the sample mean and sample variance for the following frequency distribution of heart rates for a sample of American adults. If necessary, round to one more decimal place than the largest number of decimal places given in the data. Heart Rates in Beats per Minute Class Frequency 56-62 10 11 5 12 7 63-69 70-76 77-83 84-90