In order to be accepted into a top university, applicants must score within the top 5% on the SAT exam. Given that SAT test scores are normally distributed with a mean of 1000 and a standard deviation of 200, what is the lowest possible score a student needs to qualify for acceptance into the university?
See attached data file.
Use the Current Sample "A" 51 stocks (the current price) and Old Sample "A" (the price for one year ago) to calculate a paired test to determine if there has been a significant change in these stock values in the last year. Explain in detail why this paired test would be appropriate for these data, but
Members of the general adult population volunteer an average of 4.2 hours per week. A random sample of 20 female college students and 18 male college students produced the results given in the table below. Assuming that the variances of the time volunteered by females and males are equal, at the .01 level of significance, is t
For one of the tasks in a manufacturing process, the mean time for tasks completion has historically been 35.0 minutes, with a standard deviation of 2.5 minutes. Workers have recently complained that the machinery used in the task in wearing out and slowing down. In response to the complaints, plant engineers have measured the
2. Suppose you want to test the claim that population mean miu=3.5. Given a sample size of n=34 and a level of significance of alpha=0.01, when should you reject Ho?
3. Find the standardized test statistic t for a sample with n=15, sample mean=8.7, s=0.8, and alpha =0.05 if Ho is less than or equal to 8.4.
4. Find the sta
A social service agency plans to conduct a survey to determine the mean income of its clients. The director of the agency prefers that you measure the mean income very accurately, to within + or - $500 from a sample taken 2 years ago, you estimate that the standard deviation of income for this population is about $5000 your job
A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year. The standard deviation of this sample was 9 hours.
How large a sample should be used to be 90 percent confident the sample mean is within 1.0 hour of the population mean? (Round yo
The managers in a company's East and West regions were rated on the basis of the company's evaluation system. A researcher wishes to conduct a t-test of means to determine if there is a difference between the East and West regions. Perform this calculation.
Region Manager Rating Region Manager
A consumer agency has retained an independet testing firm to examine a television manufacturer's claim that its 25-inch console lmodel consumes just 110 watts of electricity. Based on a preliminary study, the population standard deviation has been estimated as 11.2 watts for these sets. In undertaking a larger study, and using
1) Survey showed 75 new employees hired at one employment place had an average salary of $60K with standard deviation of $20K. At another employment place, the average income of 60 households surveyed showed $85K with standard deviation of $25K. At significance level of 0.05, can a surveyor conclude that population means are dif