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A quality control engineer selects an SRS of 20 sticks from a large shipment. The engineer is unaware of the fact that 5% of the sticks in the shipment fail to meet specifications. What is the probability that no more than 3 will be defective? What is the probably that more than 5 will be defective?
A fair die is rolled two times. Let A be the event that the outcome of the first roll is an odd number. Let B be the event that the outcome of second roll is at least 5.
You work in the corporate office for a nationwide convenience store franchise that operates nearly 10,000 stores. The per-store daily customer count has been steady,
Draw the scatter diagram. Does it appear that x and y are related? If so, how? Test to determine whether there is evidence of a linear relationship.
A standard deviation of $20, obtain the probability that a monthly landline phone bill for a household is less than $100.
Find a 98% confidence interval for the mean number of days required for successful completion of physical therapy for patients in the average group. Discuss the results.
What is the relationship between pretest scores and final exam scores after controlling for cumulative GPA? He also wants to know about the relationship between pretest scores and final exam scores.
Write down a paragraph about the normal distribution. In the paragraph give an example of a distribution that you would judge to be nearly normal and explain why you have made that conclusion.
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
You are a realtor with a small business. You use a simple 2 variable linear regression analysis for quick first glance house price estimates using square footage of the house.
A survey of 400 persons showed that 54.3% were in favor of product A. Test whether a majority were in favor of product A using a .05 significance level
Which of the following errors will be associated with the sample? Errors due to interviewer bias and selection bias.
Identify the population parameter of interest in the survey. Give a point estimate of the population parameter. Set up H0 and Ha for testing whether the true percentage of TV viewers who find cable news to be better quality than network news differs..
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