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A researcher selected a sample of 50 residents from each of 3 different cities to determine if they were willing to participate in a medical experiment. At a=.05, test the claim that the proportions who will participate are equal
reisdents city 1 city 2 city 3will participate 20 12 22will not " 30 38 28total 50 50 50
a)there is not evidence to reject the claim that the proportions are equal because the test value 4.861<5.991b)there is evidence tp reject the claim that the proportions are equal because the test value 12.592>1.042c)there is evidence to reject the claim that the proportions are equal because the test value 5.991>.4861d)there is evidence to reject the claim that the proportions are equal because the test value 5.991>1.042
which of the following assumptions is NOT made for the F test for comparing 3 or more means?
a)the population from which the samles were obtained must be normally distributedb)the samples must be independent of each otherc)the sample sizes must be equald)the variances of the population must be equal
A statistics professor receives an average of five e-mail messages per day from students. Assume the number of messages approximates a Poisson distribution. What is the probability that on a randomly selected day she will have no messages?
Lemon Corporation, an automobile manufacturer, is trying to determine the source of defects in some of its autos.
Why do we do power calculations with single sample z test? A) Because we can use Z area tables to calculate the power. B) Because comparing a sample mean against a population mean is very powerful
A student team in a business statistics course performed a factorial experiment to investigate the time required for pain-relief tablets to dissolver in a glass of water.
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability.
Sugar in Cereal. Different cereals are randomly selected, and the sugar content (grams of sugar per gram of cereal) is obtained for each cereal
Can you please help me develop a research question using gender and another categorical variable associated to adhd that could be address using the chi-square method?
Suppose that you draw a random sample of 27 cans. Find the probability that the mean weight of the sample is less than 6.19 ounces.
Creek Ratz is a very popular restaurant located along the coast of northern Florida. They serve a variety of steak and seafood dinners. During the summer beach season, they do not take reservations or accept a call seating.
Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
Team Marketing Report, a sports-business newsletter, estimates that the average total cost for a family of four to attend a major league baseball game is $132.
A leasing firm claims that the mean number of miles driven annually, m, in its leased cars is less than 13280 miles. A random sample of 150 cars leased from this firm had a mean of 12584 annual miles driven.
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