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His sample size was 50,000. His method worked better than the Digest"s method. He predicted the correct winner, but was still off by 6 percentage points. How did he predict the Digest prediction so
One thousand draws will be made at random with replacement from the box. you are asked to estimate the chance that the sum will be positive.
The normal distribution is always bell shaped. The normal distribution is defined in terms of its mean and variance (standard deviation). The weight gain associated with an antidepressant is normal
Create a histogram of the final fund values. Based on your simulation results, which of the two strategies would you recommend? Why?
The average cost was $405 with a standard deviation of $80. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
It seems unlikely that extremely minor differences in the p-value should lead to such dramatic differences in conclusions. Obvious tests In many cases, hypothesis testing is used when the evidence
abc auto insuraance classifies drivers as good, medium, or poor risks. Drivers who apply fall under these three groups in proportations: 30 percent, 50 percent and 20. The probability of a good driv
During registration at State University every semester, students in the college of business must have their courses approved by the college advisor.
How many more students should be included in the sample to be 99% sure the sample mean x is within $7 of the population mean u for all students at this college?
Find the life of all AA batteries with a 95% confidence interval for the mean life hours. The sample mean is 3.58 and the sample deviation is 1.85 hours.
It seems unlikely that extremely minor differences in the p-value should lead to such dramatic differences in conclusions. Obvious tests In many cases, hypothesis testing is used when the evidence i
At the .05 level of significance, test the claim that the new version has standard deviation equal to that of the past version.
A large department store examined a sample of the 18 credit card sales and recorded the amounts charged for each of three types of credit cards: MasterCard, Visa and Discover. Six MasterCard sales,
In this case, the Central Limit Theorem states that the sample mean from a simple random sample from a large population should have an approximate Normal distribution with the se(Y ) = n . The se o
The athletic director claims that the attendance is the same as last year. What is the test value needed to evaluate the claim?
Give the null and alternative hypotheses. Compute the test and p-value. Use a=0.01 to make your conclusion based on the p-value.
What percent of the variation in GPA is explained by HSM and SATM in your model? 11.12 How well do verbal variables predict the performance of computer science students?
find the probability that the average diameter of those sand dollars is more than 4.13 centimeters. Assume that the variable is normally distributed.
Assume that a 95% confidence interval estimate of the population mean annual starting salary is desired. what is the planning value for the population standard deviation ( to the nearest whole numbe
A researcher conducted a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of esti
A report states that 38% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 4% with 95% confidenc
Your local newspaper contains a large number of advertisements for unfurnished one-bedroom apartments. You choose 10 at random and calculate that their mean monthly rent is $540 and that the standar
Should mean disposable income be used to predict sales based on the sample of 14 Sunflower stores? Should the management of Sunflowers accept the claims of Triangle's leasing agents? Why or why not?
A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with a standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher th
At a certain university, the average attendance at basketball games has been 3325. Due to the dismal showing of the team this year, the attendance for the first 8 games has averaged only 2965 with a