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Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a standard deviation of 10. Females had a mean of 185 and a standard deviation of 12. Concern was expressed by the health educators that students with serum cholesterol levels above 200 might be at an increased risk of heart disease. If the campus was equally divided between males and females, how many students would be at increased risk?
a random sample of 100 credit sales in a department store showed an average sale of 120.00. from past data it is known
Three cards are randomly selected from an ordinary deck of cards without replacement Compute the probability that the first card is a spade given that the second and third are spades.
A local company is going to replace its legacy system with an eHR-based solution to improve recruiting and hiring efforts, both internally and externally.
Get the data on eruption times and waiting times between eruptions of the Old Faithful geyser from the website. Estimate the mean waiting time and give a standard error for the estimate. Also, give a 90 percent con?dence interval for the mean wai..
the manager of a computer software company is studying the number of hours too executives spend at their desktop
the time it takes a cell to divide called mitosis is normally distributed with an average time of one hour and a
Customers arrive according to a Poisson process with rate A outside a bank where there are two automated teller machines (ATM). The two ATMs are not identical. We estimate that 30% of the customers use only ATM no.
A random sample of size 16 is chosen from a population and a 90% confidence interval for the standard deviation will be determined. What value of should be located in the chi-square distribution table?
There are four distinct types of human blood denoted by O, A, B and AB. Suppose that these types occur with the following frequencies: 0.45, 0.40, 0.10, 0.05, respectively. If 20 people are chosen at random, what is the probability that:
70 people received a higher score on the second test, 13 a lower score, and 1 received the same score. At the 0.05 significance level, test the claim that the music has no effect on memorization skills.
What is the population under consideration and what are the two variables under consideration and find the conditional distributions of birth region.
1. For a normal population with a known variance, suppose that an investigator believe that approximately 95% values are between 38 and 70. The appropriate sample size for estimating the true population mean μ within 2 units with 95% confidence le..
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