for a sample of n 70 find the probability of a sample mean being greater than 214 m 213 and o 4.8

Probability of an Event - So far, we have introduced the sample of an experiment and used it to describe events. In this section, we introduce probabilities associated to the events. If a trial results in n-exhaustive, mutually exclusive and equally likely ca..

The generalization of the foregoing example, where the sample space is partitioned into n subsets is known as Law of Total Probability..

The mean weight of girls in grade 12 of school X is 125 pounds, and the standard deviation is 20 pounds. If a sample of 25 girls is selected, then what is the probability that the mean of the sample will be greater than 128 pounds? Assume ..

In 2002 Football World Cup finals tournament a total of 64 matches were played and an average of 2.52 goals were scored per match. Assume the standard deviation to be 1.5. If a random sample of 10 games is selected, then find the probability that the mean of ..

The average annual salary in a district is $30,000. Assuming that the salaries were normally distributed for a certain group of wage earners with a standard deviation of $5,000, what is the probability that for a randomly selected sample of 70 earners the mean..

What is the formula to find the z score for the difference between two population means, if X 1 and X 2 are the sample means, s 1 2 and s 2 2 are the sample variances and n 1 and n 2 are the size of the samples? (Assume both n 1 and n 2 ar..

A standard notebook is supposed to have on an average, 200 pages, with a standard deviation of 2 pages. From a supply of 2500 notebooks, a random sample of 40 notebooks was taken and found that the mean number of pages in the notebook was 197. State the null hypothesis(H oh..

A retail garment shop receives a shipment of trousers, with a standard length of 49.0 in. and a standard deviation of 1.0 in. A random sample of 32 trousers had a mean length of 48.8 in. State the null hypothesis(H o ) and alternative hypothesis(H a ). => H h..

A company makes wooden wardrobes having a standard height of 55 in., with a standard deviation of 2.5 in. In a random sample of 23 wardrobes, 6 wardrobes measured 58.5 in., 8 wardrobes measured 53.8 in. and 9 wardrobes measured 56 in. State the null hypothesis(H o..

Choose the correct statement for using the t test for the mean of a population. => Population standard deviation is unknown and sample size is greater than or equal to 30. or Population standard deviation is known and sample size is greater than or ..