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Find the midrange for the following group of data items:
29,26, 25, 24, 30, 27, 23, 25
what is the midrange rounded to the nearest tenth?
According to the U.S. Bureau of the Census, 75% of adults regularly drank alcohol in 1985. An investigator predicts that fewer adults drink now than drank then.
Incomes in the thousands of dollars were sampled in one region, they are as follows (1.5, 3.0, 4.2, 5.6, 2.6, 4.1, 0.9, 5.7, 5.4, 2.6) Assume the population is normal.
Researchers routinely choose an alpha level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower alpha level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?
A discrete random variable Y takes the value -1, 0 and 1 with probabilities 1/2θ, 1- θ and 1/2θ respectively. Let Y1 and Y2 be two independent random variables, each with the same distribution as Y.
The best measure of central tendency for this scenario would be to use median as it is not affected by extremely large values.
In a sample of 30 randomly selected women, it was found that their mean height was 63.4 inches. From previous studies, it is assumed that the standard deviation is 2.4.
Find out a 95 percent confidence interval for population mean.
What is a hypothesis? Specifically, is it a statement about the population or the sample? What is the purpose of hypothesis testing?
Assume the shopping time followed an approximately normal distribution. Use a 5% level of significance to test the claim that the average shopping time foe women with children in Carson mall is higher than the national average for this type of sto..
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
Assume that the population is 0.55. Compute the standard error of the sample proportion for the following sample sizes:
Misery loves company. It is time for the PE (professional engineer's exam). The results of the national test were normally distributed around the mean score of 70.
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