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A researcher conducted a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in his new sample?
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
Using the 0.05 level of significance, is there evidence that the population mean is above $190? What is your answer in (a) if s = $50 and the 0.10 level of significance is used?
A scientist wants to estimate the proportion of plants with berries growing in a particular region. They want to be within 6% of the true proportion.
A random sample of n = 16 scores is selected from a normal distribution with a mean of μ = 50 and standard deviation of σ = 10. a) What is the probability that the sample mean will have a value between 45 and 55?
Alternative C would have fixed costs of $100,000 and variable costs of $15 per unit. Revenue is expected to be $50 per unit. Which alternative has the lowest break-even quantity?
Given that a respondent is over age 50, what is the probability that he or she gets news primarily from newspapers?
Mr.Smith works on a temporary basis. The mean length of each job he gets is three months. If the amount of time he spends between jobs is exponentially distributed with distributed with mean 2, then at what rate does Mr. Smith get new job?
Assuming that a plane make a safe flight if at least one-half of its engines run, determine whether a 4-engine plane or 2-engine plane has the higher probability for a successful flight.
Following data from an x bar chart, is the process capable (capability index>1.33)?
How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
What is the computed z-value for testing the null hypothesis that the proportion of successes in Population 1 exceeds the proportion of successes in Population
N=120, population standard deviation is (known) 5, alpha =.05, standard error of the mean (sigma of xbar)= .46, h0 is rejected if xbar
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