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Calculate the Pearson correlation for the scores. Find the regression equation for predicting Y from the X values. Use: Sp/SSx to obtain the slope b. Then use a = My - b*Mx.
The number of viewers of American Idol has a mean of 26 million with a standard deviation of 8 million. Have between 30 and 37 million viewers?
The computer disc company found that 80 of its drives that were selected at random from a large production had 8 defective discs. Determine a 98% confidence interval for the population proportion o
The MPG (Miles per Gallon) for a mid-size car is normally distributed with a mean of 32 and a standard deviation of .8. What is the probability that the MPG for a selected mid-size car would be les
What information is provided by the numerical value of the Pearson correlation? In the text. Compute the Pearson correlation. You should get -0.8333 according to my quick calculation. So, double check
A standard deviation of 36 donuts. If a sample of 16 stores results in a sample average of 249 donuts what is the standard error of the mean?
A random sample of 8 recent batches produced the following yields. Conduct a hypothesis test to determine whether the true mean yield has decreased. Use an a=0.01
Does this indicate that monthly sales have changed (in a statistically significant sense)? Use 0.05. Assume monthly sales are normally distributed.
A representative of the Environment wants to select samples form 10 landfills. The director has 15 landfills from which she can collect samples. How many different samples are possible?
Also, 68 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employees who either have MBAs or are managers.
A video rental store has two video cameras available for customers to rent. Historically, demand for cameras has followed this distribution. The revenue per rental is $40. If a customer wants a came
A large hat manufacturer, MICHAELLA HATS, is concerned that the mean weight of their signature Kentucky Derby hat is not greater than 3.5 pounds. It can be assumed that the population standard devia
Five stocks listed on NASDAQ. At the .10 significance level, can we conclude that the annual rates of return are higher on the big board?
The director of admissions at the University of Maryland, University College is concerned about the high cost of textbooks for the students each semester. A sample of 45 students enrolled in the uni
The guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule. (b) Is this a close decision?
Compute a 90% confidence interval for the population mean, based on the sample 25, 27, 23, 24, 25, 24, and 59. Change the number from 59 to 24 and recalculate the confidence interval. Using the resu
a. Complete the table to make this a valid probability distribution. b. What is the probability an applicant's GPA will be below 3.0?
According to Investment Digest ("Diversification and the Risk/Reward Relationship", Winter 1994, 1-3), the mean of the annual return for common stocks from 1926 to 1992 was 15.4%, and the standard d
Calculating the number of permutations when selecting 3 different side dishes from the 16 available choices. What was the incorrect number stated by Joe Montana in the ad?
Suppose that 255 such companies are selected independently and at random. (a) What is the probability that 186 companies in the sample electronically monitor their employees?
It is estimated that 3% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 90% accurate.e What is the probability that an
A 95% confidence interval for the population proportion of professional tennis players who earn more than 2 million dollars a year is found to be between .82 and .88. Given this information, what th
Find the average of the random variable X= # of smokers in a random sample of 50 residents of the USA, also find the variance and standard deviation of X.
If a population has standard deviation 12, what is the minimum sample size to be 95% confident that the error should be accurate to within 5?
How many spare tubes must the building custodian maintain to have at least 0.95 probability of replacing all failures on a given day?