A sample of n=5 scores has a mean of M = 12. if one new score with a value of x =17 is added to the sample then what is the mean for new sample

The sample data here is the cholesterol levels for 10 men diagnosed with high cholesterol. The first row represents levels from 10 men who did not use the drug and the second row from 10 different men who did use the drug. If we want to test the claim that the mean level for all men who use the drug is less than the mean for all men who do not use it, what is the appropriate alternative hypothesis?    The mean cholesterol level of males who take the medicine is higher than the mean cholesterol levels of men who do not take it.       There is a significant difference between males who use the medicine and men who do not use the drug in terms of mean cholesterol levels.       The mean cholesterol level of males who take the medicine is lower than the mean cholesterol levels of men who do not take it.       There is no significant difference between males who use the medicine and men who do not use the drug in terms of mean cholesterol levels.

Find the variance if X~N(0, 7) and 95% of the data are between -7 and 7.

the statistic X defined as X = 49S 2

a population has mean score of 50 if five points are added to each score what is the new mean

What proportion of the distribution of sample means is between a z  of 1.34 and z of -1.00?

A research scientist wishes to test the claim that the mean number of children per classroom in California elementary school is less than 35. She selects a simple random sample of 29 California elementary school classrooms. She know nothing about the distribution of children in classrooms. Can she use the data to test her claim?

Suppose that the mean score of a class of 28 students was 77. The 16 male students in the class had a mean score of 64. What was the mean score for the 12 female students? Mean Score for Female Students =

IQ scores are normally distributed with a mean of 100 and a variance of 225. What percentage of people score between 130 and 145?

On average, a sample of n = 36 scores will provide a better estimate of the population mean than a sample of n = 49 scores from the same population.