Today, full-time college students report spending a mean of 27 hours per week on
ID: 3172467 • Letter: T
Question
Today, full-time college students report spending a mean of 27 hours per week on academic activities, both inside and outside the classroom. Suppose the mean the variance of the sampling distribution of the mean for samples of 99 students is 2. What will be the variance of the sampling distribution of the mean for 23 students? Answer accurate to 4 decimal places. If you draw a sample of N = 189 from a population of light bulbs with a mean lifetime of 1.525 hours and a variance of 22. What will be the population mean of the sampling distribution of all the sample means? Answer accurate to two decimal places. Out of a population of 1.328 light bulbs, 163 are defective. You take samples of 96 of these light bulbs. What is the standard error of all the possible sample proportions of light bulbs that are defective? Answers accurate to 4 decimal places.Explanation / Answer
The mean of the sampling distribution of the mean is the mean of the population from which the scores were sampled. Therefore, if a population has a mean , then the mean of the sampling distribution of the mean is also .
the variance of the sampling distribution of the mean is the population variance divided by N, the sample size (the number of scores used to compute a mean). Thus, the larger the sample size, the smaller the variance of the sampling distribution of the mean.
Questin 4.
Variance = Populatuon variance/N
=2/99
=0.020
Question 5.
sampling distribution of the mean=1525