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City A has a population of 4 million, and city B has 6 million. Both cities have the same proportion of women. A random sample (with replacement) will be taken from each city, to estimate this proportion in each of the following case, say whether the two samples give equal good estimates, and if you think one estimate is better than the other, say how much better it is.
a) A 0.01% sample from each city.
b) A sample of size 400 from each city.
c) A 0.1% sample from city A, and a 0.075% sample from city B.
a researcher notes that the correlation in the group she studies is so large that if there were not a correlation among
If you suspect that the claim exaggerates the cost, how would you set up the null and alternative hypotheses?
A company provides its three employees with health insurance under a group plan. For each employee, the probability of incurring medical expenses during a year is 0.9, so the number of employees incurring medical expenses during a year has a binom..
What is the mean of the distribution of sample means with a sample size - what percentage of sample means are greater than 7.7 hours?
A manufacturer produces a batch of memory chips (RAM) and measures the mean-time-between-failures (MTBF). The manufacturer then changes a manufacturing process and produces another batch and again measures the MTBF
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imagine you are a manager at a major bottling company. customers have begun to complain that the bottles of the brand
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Construct a 99 percent confidence interval for the mean commission earned by local Tupperware dealers. You may assume the commissions are normally distributed.
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The number of complaints that a dry-cleaning establishment receives per day is a random variable having a Poisson distribution with λ = 3.3. Use the formula for the Poisson distribution to find the probability that it will receive only two compla..
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