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Testing for Population mean.
Bookstores like education, one reason being that educated people are more likely to spend money on books. National data show the nationwide average educational level to be 13 years of schooling completed, with an SD of about 3 years, for persons age 18 and over. A bookstore is doing a market survey in a certain country, and takes a simple random sample of 1,000 people age 18 and over. They find the average educational level to be 14 years, and the SD is 5 years. Can the difference in average educational level between the sample and the nation be explained by chance variation? If not, what other explanation can you give?
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
Does the weight of a vehicle affect the gas mileage? The following random sample was collected where x = weight of a vehicle in hundreds of pounds and y = miles per gallon.
Crete a 90% confidence interval for mean Secchi dish measurement.
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
Assume a one-tailed t -test is being applied to determine if population mean is less than $212. Level of significance chosen is 0.01 and 26 accounts are sampled. Determine the critical value?
Please use a combination of content and supportive examples.
Use population distribution to determine expected juror frequencies. Test researcher's claim at a = 0.01.
A study regarding the relationship between age and the amount of pressure sales personnel feel in relation to their jobs revealed the following sample information.
Find the lowest possible score a candidate can score and still qualify. Assume the scores are normally distributed.
A market survey was conducted to estimate the proportion of homemakers who would recognize the brand name of a cleanser based on the shape and color of the container. Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name.
Find a 95% confidence interval for the percentage of girls and women in Taiwan who had antibodies at that time.
Test whether the music reduces studying capacity at a .05 level of significance.
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