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Assume the variable is normally distributed. (a) If a proofreader is selected randomly what is the probablity that his/her age is between 35 and 37?
Using the Consumer Price index (CPI), what was the purchasing power of the dollar in 2007?
In a recent survey concerning company sales and net earnings, 11 companies responded. Data analysis was computed, letting sales ($ thousands) be the independent variable, and net earnings ($ thousan
If employees are selected, one at a time, stopping as soon as a male employee is selected, what the probability that exactly three employees will be selected?
What is the standard error of the mean? How would the standard error change if the sample size had been 100 instead of 25?
A sample of 20 automobiles produced a standard deviation of 2.6 miles per gallon. Is the standard deviation really less than previously thought?
A researcher wishes to test the claim and selects a random sample of 80 teenagers. She finds that 57 have their own MP3 players. At a=0.05, should the claim be rejected?
A standard deviation of 0.67 inches. Show all work. What percentage of the grapefruits in this orchard is larger than 5.87 inches?
A recent study examined the number of unemployed people in 5 cities who are actively seeking employment. AT alpha = .05, is there a difference in the number based on level of education earned?
The chance of being successful on any one venture is 25%. What are the corporation's chances of all nine ventures being unsuccessful?
At the .045 significance level, test whether the mean of the population from which this sample was taken is significantly different from 10.
A sample of legal costs (in thousands of dollars) for school districts for two recent consecutive years is shown. At alpha = .05, is there a difference in the costs? Use wilcoxon signed-rank
To test the claim that there is no difference in the lifetimes (in months) of two brands of video games, a sample of each was selected as indicated in the table. At "alpha" = 0.01, can we conclude
Two different lab machines measure the sodium content (in milligrams) of the same 10 blood samples (below.) At "alpha" = 0.01, test the claim that both gave the same readings.
Explain why increasing the sample size tends to result in a smaller sampling error when a sample mean is used to estimate a population mean.
After four weeks, the reduction in each person's blood pressure is recorded. At "alpha" = 0.05, use ANOVA to test the claim that there is no difference among the means. If the null hypothesis is re
A national survey claims that people buy music compact disks in equal percentages for the following five age groups:
Three missiles are fired at a target, with probabilities 0.7, 0.8, and 0.9 of hitting the target, respectively. Assume independence. What is the probability that the target is hit?
If we select 90 students (ASSUME INDEPENDENCE), what is the Standard Deviation of the Probability Distribution that would list the number of students (from 0 to 90) and the probability of each.
The regression equation between years of employment (X) and discount amount (Y) % at the Happy cafeteria. For how many years you need to be an employee in order to get a 25% discount.
A sample of 200 college students resulted in the numbers below. At "alpha" = 0.05, can we conclude that opinions of college students differ from those in the national survey of adults?
How do we know whether to make the standard deviation in the denominator = 'standard deviation/root(n)" or just "standard deviation"?
Their rolls are independent. Roger wins if the number on his die is strictly grater than the one on Harry's die. This game is played 5 times. What is the probability that Roger wins at least 4 times?