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A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, what is the 99% confidence interval for the population average examination score ?
Statistics and Probability, Statistics
A musical instruments retailer has 10,000 point-of-sale transactions out of which 1500 sales included both items of electric guitars and guitar cases, and out of which 750 had sales of new strings. If the electric guitar ...
There are 3 orange balls and 17 blue balls that are in a bag. A person reaches into the bag, without looking, and pulls one of the balls out of the bag. What is the probability that the ball is orange?
1. A chemical supply company ships a certain solvent in 10-gallon drums. Let X represent the number of drums ordered by a randomly chosen customer. Assume X has the following probability mass function (pmf). The mean and ...
The commissioner of the state police is reported as saying that about 10% of reported auto thefts involve owners whose cars haven't really been stolen. What null and alternative hypotheses would be appropriate in evaluat ...
If I had to collect and assess the quality and appropriateness of data held by a large, multi-national organization. What steps should I take? How would I address network, security, and ethical considerations when decidi ...
A manufacture claims that the life span of its tires is 52,000 miles. You work for a consumer protection agency and you are testing these tires. Assume the life spans of these tires are normally distributed. You select 1 ...
In a recent year, 8,415,394 male students and 4,879,215 female students were enrolled as undergraduates. Receiving aid were 62.9% of the male students and 68.3% of female students. Of those receiving aid, 41.9% of the ma ...
You ask your roommate to mail a letter for you. Suppose there is a 0.21 probability your roommate will forget to mail it. Should your roommate mail your letter, there is a 0.9 probability that Canada Post will deliver t ...
Two people agree to meet at a coffee shop. They each independently pick a random moment in time between 8 a.m. and 9 a.m. and show up exactly at their selected time. But they are very impatient, and only stay for 10 minu ...
1. A STAT 200 instructor wants to know if students tend to score differently on the lesson 4 and 5 quizzes. Data were collected from a representative sample of 60 students during the Summer 2018 semester. Data were paire ...
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
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Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As
Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int
Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As