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Use the significance level of alpha = .05 to test claim that p > .5. Sample is simple random sample n = 50. Illustrate how to compute beta for test and suppose true population proportion is .6.
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
A new machine has just been installed to cut and rough-shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter.
A state survey investigates either the proportion of 8percent for employees who commute by car to work is higher than it was five years ago.
Assume that a sample is drawn and z(α/2) = 1.65 and σ = 35. Answer the following questions. (A) If the Maximum Error of Estimate is 0.04 for this sample, what would be the sample size?
Students applying for admission to an MBA program must submit scores from the GMAT test, which includes a verbal and a quantitative component.
Number of rescue calls received by rescue squad in city follows a Poisson distribution with mu = 2.83 per day. Squad can handle at most four calls a day. Determine the probability that squad will be able to handle all calls on a particular day?
A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati..
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
What is the distinction between a one-sided and a two-sided hypothesis test in this problem?
It is believed that population standard deviation is 15 days. If test is conducted using 0.05 level of significance, what conclusion must be reached?
A market researcher is interested in knowing the type of training that works best for DVD users. Thirty consumers are randomly selected from a population of known DVD owners (i.e., users).
Calculate a 95% confidence interval for the mean endowment of all the private colleges in the United States assuming a normal distribution for the endowments.
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