What do the variance, S.E., or standard deviation estimates tell you about your population that the mean does not tell you? Why is it important to report some measure of variation, along with the sample size, whenever you report a calculated mean?
What do the variance, S.E., or standard deviation estimates tell you about your population that the...
What does the variance or standard deviation tell you about a population that the mean does not tell you? The mean, median, and mode are three different statistical approaches to describe the middle individual in a population. Explain which of these statistics of location should be used when viewing a histogram ?
Generate 20 samples of size n = 30 from your population. To do this: i. Generating a sample of just size n = 30. Calculate the sample mean, X¯, for this sample. Record this value somewhere in your spreadsheet (you will need it later). ii. Repeat the previous step 19 more times, so that you end up with a spreadsheet with 20 columns, each column has 30 randomly generated values from your population, and you have calculated a sample mean...
A variable of a population has a mean of 100 and a standard deviation of 28. Consider the sample distribution of samples means of sample size 49. a. What is the mean of sample means? b. What is the standard deviation of the sample means? c. Is the distribution of sample means normal? Why or why not? Do we need to know if the variable in question is normally distributed in the population? Why or why not?
a) If we assume the population mean is 98.60 and the standard deviation is 0.6, what is the probability of a single person having a temperature of 98.25 or less? (Round to four decimal places. This should be the theoretical probability that is calculated, NOT the empirical probability from the simulation.) b) If we assume the population mean is 98.60 and the standard deviation is 0.6, what is the probability of obtaining a sample mean of 98.25 or less from...
A population has parameters of mean=15.2 and standard deviation=78.5. You intend to draw a random sample size=239. What is the mean of the distribution of sample means? What is the standard deviation of the distribution of sample means? (Report answer accurate to 2 decimal places.)
a variable of a population has a mean of 79 and a standard deviation of 18. a. Identify the sampling distribution of the sample mean for samples of size 81. b. In answering part (a), what assumptions did you make about the distribution of the variable? c. Can you answer part (a) if the sample size is 25 instead of 81? Why or why not? a. What is the shape of the sampling distribution? uniform bimodal skewed normal? What is...
33. What sample size would you need in order to increase the precision of your estimate by 15-fold? Mean 6.118 Variance-1.235 Standard Deviation-1.174 33. What sample size would you need in order to increase the precision of your estimate by 15-fold? Mean 6.118 Variance-1.235 Standard Deviation-1.174
Consider a family of four people, aged 8, 10, 33, and 37 as a population a) Calculate the population variance and standard deviation for the ages. Show your work step by step b) Random samples of size two are drawn with replacement from this population and their ages are recorded Find the variance and standard deviation for each sample (using the formula that involves divisions by n-1) and fill in the 3rd and 4th columns of the table Find the...
Suppose your marketing colleague used a known population mean and standard deviation to compute the standard error as 56.4 for samples of a particular size. You don't know the particular sample size but your colleague told you that the sample size is greater than 70. Your boss asks what the standard error would be if you triple the sample size. What is the standard error for the new sample size? Please round your answer to the nearest tenth.
Suppose your marketing colleague used a known population mean and standard deviation to compute the standard error as 49.6 for samples of a particular size. You don't know the particular sample size but your colleague told you that the sample size is greater than 60. Your boss asks what the standard error would be if you double the sample size. What is the standard error for the new sample size? Please round your answer to the nearest tenth.