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A sporting goods producer claims that the variance of the strengths of a certain fishing line is 15.9. A random sample of 15 spools has a variance of 21.8. At "alpha" = 0.01, can the claim be proven
Find that a random sample of 14 similar cars has a mean of price of $19,850 with a standard deviation of $1084. Is there enough evidence to reject the salesman's claim at "alpha" = 0.05?
Consider a finite size population for N in which you want to study a variable y that takes a very small value for the first element of the sampling frame
Give an example of how to use a t-test to analyze the data from the Table of Variables and list the grouping variable and continuous variable that you would include in the analysis
International Agricultural Producers publishes annual data on various selected farm products. Shown above are the unit productions figures (in millions of bushels) for three farm products for 10 yea
State the null and alternative hypotheses and what is the p-value for a sample of 180 undergraduate students with a sample mean credit card balance of $3325?
Develop a regression model to identify the fixed overhead costs to the consulting group and what is the constant component of the consultant group's overhead?
Determined that the outbreak was caused by ice cream from one company. They sampled 9 production runs and found the level of Salmonella
How many automobiles should be used in the test? Assume that preliminary mileage tests indicate the standard deviationis 2.6 miles per gallon.
A pizza restaurant manager claims that the average home delivery time for their pizza is no more than 20 minutes.
What is the probability of selecting a family that has either a Visa card or an American Express card and if a family has a MasterCard, what is the probability that it has a Visa card?
Find the 90% confidence interval for the variance and standard deviation if a sample of 15 has a standard deviation of 2.3. Assume the variable is normally distributed.
Obtain descriptive statistics and graphic displays for these salt-taste indices. Do the indices appear to be normally distributed? Why or Why not? Compute the sample mean for this index, and obtain
Find the best point estimate of the mean and find the 95% confidence interval of the mean score for all golfers.
How large a sample must one take to be 90% confident that the estimate is within 0.05 of the true proportion and find the 99% confidence interval of the population proportion of persons living in Phoe
Frequently, tests that yield abnormal results are repeated for confirmation. What is the probability that for a normal person a test will be at least 1.5 times as high as the upper limit of normal o
Suppose that among workers exposed to asbestos in a shipyard in 1980, 33 died over a 10 year period from COPD, whereas only 24 such deaths would be expected based on statewide mortality rates. Is th
Of all 3 - 5 year old children, 71% are enrolled in school. If a sample of 400 children are randomly selected, what is the probability that at least 300 will be enrolled in school.
Find the probability that the age of a randomly selected CEO will satisfy each condition - The average teacher's salary in timbucktoo is $29,863. Assume a normal distribution with a standard deviation
State the appropriate null and alternative hypothesis for testing the standard regarding the mean value. Test the hypothesis using a significance level equal to 0.05. What assumption will be require
Calculate the interquartile range and construct the less then give
Find the area between z = -0.65 and z = 0.37, find the area to the right of z = 2.35
A social scientist believes that university theology professors are more conservative in political orientation than their colleagues in psychology
The Appliance Centre sells a variety of electronic equipment and home appliances. For the last four years the following quarterly sales (in $ millions) were reported.
Formulate the null hypothesis and the alternative hypothesis.