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Determine how many people you would have to sample in order to estimate this proportion to within .025 with 90% confidence.
An opportunity sample of 50 undergraduate students was asked to complete a series of personality questionnaires investigating the "Dark Triad" of personality (Lee & Ashton, 2005).
State the appropriate null and alternative hypotheses in symbols. Calculate the test statistic. Determine (as accurately as possible) the p-value of the test. State your test decision at the α =
Determine and interpret a 90% confidence interval for the mothers mean age (at student's birth) in the population of all students at this university.
State the appropriate null and alternative hypotheses, in words and in symbols. Calculate the test statistic and p-value. Would you reject the null hypothesis at the α = .10 significance level?
Based on this interval (do not conduct the test), would he reject the null hypothesis at the α= .05 significance level? Explain briefly (no more than one sentence)
Run the regression model you developed and interpret the results
A 2004 survey of randomly sampled Utah residents found that 10.5% (0.105) of them smoked regularly. Calculate the z-score for the sample proportion ˆp = 0.125.
Does the interval provide strong evidence that the long-run population proportion of heads is much different from one-half? Explain briefly.
Find the conditional distribution of vehicle type given that the transmission is automatic.
What is the expected number of passengers who show up that will not get a seat on the flight? What is the expected number of empty seats on the flight?
Question: Suppose you draw a card randomly from a regular deck of cards. Let Abe the event that the card is red, and Bthe event that the card is a 9.
Consider rolling a pair of fair dice. What is the probability that the number of dots on the upward side of both dice is the same (i.e., you roll (1,1) or (2,2) or (3,3) or (4,4) or (5,5) or (6,6))
Question: A high volume production process produces, on average, 3.4 defective parts per hour, and the number of defects in an hour follows a Poisson distribution. Let Xi= the number of defects pro
Find the joint distribution of vehicle type (passenger car / truck) and transmission type (automatic / manual) in New York.
A pair of dice is rolled. The sum of the faces on top is observed. What are the expectation, variance, and standard deviation of the observed sum? The Expectation and Variance Template attached to t
What are the false negative and false positive accuracies? If a female tests positive for breast cancer, compute the likelihood that she indeed has the cancer.
Specify how the conditions for that distribution are met. Suggest reasonable values for n and p (binomial) or mu (poisson) for your example. Calculate the mean and standard deviation of the distribu
Give a scenario (preferably related to your area of expertise or work experience) in which a judgmental forecasting method would be used. Which particular judgmental forecasting method (or methods)
Peas are generated from parents having the green/yellow pair of genes, so there is a .75 probability that an individual pea will have a green pod.
If you must estimate the population mean within 2 days, how many outside salespeople should you sample? Use the 90 percent confidence level.
A recent study by an automobile dealer revealed the mean amount of profit per car sold for a sample 20 salespeople was $290, with a standard deviation of $125. Develop a 95 percent confidence interv
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.09 kg.
Zack Schadek, the owner, received a large shipment this morning. To ensure the quality of the shipment, he selected a random sample of 300 cups. He found 15 to be defective. a) What is the estima