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Your manager wants to know how many random samples should be selected to determine the percentage of people in New England who traveled more than 200 miles from home at least once during the past year. Furthermore, you need enough samples to be 90 percent certain that the true percentage will lie within 6 percent of your samples finding. You have no idea what the true proportion might be.
How many samples do you need to select?
You intend to measure the mean age of customers in a certain population. You want to measure this mean age within 3 years with 95 percent confidence. You have evidence that the variance of agers in this population is 400.
How many samples will have to be selected?
according to a survey 62 of murders committed last year were cleared by arrest or exceptional means. fifty murders
A research paper claims a meaningful contribution to the literature based on finding statistically significant relationships between predictor and response
Childhood obesity is a major problem these days. Obviously our public health officials have not been doing their job.
Identify all variables in these research projects and classify them by their level of measurement. Which variables are independent and which are dependent?
Let X be net income of the AirCanada from the above described random experiment. Compute the probability function of X.
the following question was put on a questionnairewhat was your last salary?a 0 -10000b 10001 - 20000c 20001 - 30000d
400 customers of the company and finds that 30 of them are actually not happy about the service. Set up the null and alternative hypotheses to test for the company's claim.
It is well-known that the relationship between degree Fahrenheit (F) and degree Celsius(C) is, F = (9/5)*C + 32
Calculate the probability of getting all defective tires in samples of size 25, 30, and 50 for p = 0.80, 0.90, 0.95, and 0.99, where pis the probability
testing for population proportion -the personnel director of a large insurance company is interested in reducing the
Terrance want to find a 95% confidence interval for the true proportion of the population who favor the bill. What is the lower limit of the interval?
The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year.
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