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A chi-square test for goodness of fit is used to test whether or not there are any preferences among 3 brands of cola. If the study uses a sample of n = 60 subjects, then the expected frequency for each category would be
A. 1
B. 15
C. 20
D. 30
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
Construct and interpret 90 percent on confidence interval for the mean. Be sure to interpret the meaning of this interval.
The Quick Change Oil Company has a number of outlets in the Seattle area. The daily number of oil changes at outlet in past twenty days are:
An electronic circuit board fails randomly with failure rate of λ=0.00021 /h. When it fails it is replaced by a new board.
Determine the probability of randomly selecting a person graduating with Master's degree who didn't major in Education.
What is the proportion of people surveyed that rated the subway system from 3 to 4. What is the proportion of people surveyed rated the Subway System from 1 to 3.
A study is conducted to determine if the traffic light patterns at a busy intersection need to be adjusted to help the flow of traffic. Data on the volume of traffic and the traffic patterns during different times of day are recorded.
The F-test cannot be used to answer whether or not there is a significant difference between the means.
The machine will stop working if more than three components fail. Find the probability that the machine will be working.
Which of given is the correct decision statement for test?
A sports researcher gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows:
A nationwide real estate company claims that its average time to sell a home is 57 days. Suppose it is known that the standard deviation of selling times is 12.3 days and that selling times are normally distributed.
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