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You take a sample of 22 from a population of test scores and the mean of your sample is 60. A) you know the standard deviation of the population is 10.
What percentage of people falls between -2 and +2 standard deviations on IQ scores ( if the general population of IQ scores assumes a normal distribution )?
What is the probability that the mean of a random sample will be equal to or greater than the 97.5 percentile of its corresponding sampling distribution?
A company's raw data sample of weekly salaries (in dollars) is shown below.
The produce manager for a large retail food chain is interested in estimating the percentage of potatoes that arrive on a shipment with bruises. A random sample of 150 potatoes showed 14 with bruise
Based on these sample data, what is the best point estimate to use as an estimate of the true mean tip per delivery?
A production process that fills 12-ounce cereal boxes is known to have a population standard deviation of 0.009 ounce. If a consumer protection agency would like to estimate the mean fill, in ounces
What is the probability that a drought lasts exactly 3 intervals? At most 3 intervals? What is the probability that the length of a drought exceeds its mean value by at least one standard deviation?
Compute a 90% tolerance interval on the compressive strength of the concrete that has 90% confidence.
A sample of 250 people resulted in a confidence interval estimate for the proportion of people who believe that the federal government's proposed tax increase is justified is between 0.14 and 0.20.
A bank manager wanted to double-check her claim that recent process improvements have reduced customer wait times to an average of 3.3 minutes, with a standard deviation fo 1.0 minutes. To test thi
A simple random sample of 240 people was asked if they have insurance coverage, and 66 replied that they did not have coverage. Based on these sample data, determine the 95% confidence interval esti
The breaking strength of Flimsy safety belts is known to be approximately normally distributed with a population mean of 8000 pounds and a population standard deviation of 250 pounds. If a simple ra
A decision maker is interested in estimating a population proportion. A sample of size n = 150 yields 115 successes. Based on these sample data, construct a 90% confidence interval estimate for the
Consider the continuous triangular distribution y=x/4.5, where 0<x<3. a) What is the probability of 0<x<3? b) what is the probability of x=2? C) What is the probabbility 0<x<1? D)
1. Suppose you are calculating an Analysis of Variance for a completely randomized design. You are testing the hypotheses:
Airline managers expect that only about 15% will say "yes." Based on this assumption, what size sample should the airline take if it wants to develop a 95% confidence interval estimate for the popul
The following probability distribution represents the number of people living in a Household (X), and the probability of occurrence (P(X)). Compute the Expected Value (mean), the Variance and the S
The lifetime of a semiconductor laser has a lognormal distribution, and it is known that the mean and standard deviation of lifetime are 10000 and 20000, respectively.
The weights of ripe watermelons grown at Mr. Smith's farm are normally distributed with a standard deviation of 2.7 lb. Find the mean weight of Mr. Smith's ripe watermelons if only 2% weigh less th
The number of customers entering a store on a given day is Poisson distribution with mean lambda =10. The amount of money spent by a customer is uniformally distributed over (0, 100). Find the mean
Using this data, obtain and interpret a 95% confidence interval estimate for the proportion of male passengers in the population who would have been affected by the one-bag limit.
The 70-year long-term record for weather shows that for New York State, the annual precipitation has a mean of 39.84 inches and a standard deviation of 4.27 inches. The annual precipitation amount h
Formulate hypotheses that can be used to determine whether the population mean annual administrator salary in Ohio differs from the national mean of $90,000.