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A market research firm used a sample of individual to rate the purchase -potential of a particular product before and after the individuals saw a new television commercial about the product. The purchase potential ratings were based on a 0 to 10 scale, with higher values indicating higher purchase potential. The null hypotesis is stated that the mean ratings "after' would be less than or equal to the mean rating "before".
Individual 1 2 3 4 5 6 7 8 After 6 6 7 4 3 9 7 6Before 5 4 7 3 5 8 5 6
a) carry out the an appropriate test (at 5% los) base on the above data, and infer whether the commercial has imporved the mean purchase rating.
b) Justify the choice of the test.
They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.
How many 3-level Latin Squares are possible? {A "different" Latin Square in this case is one that does not have the same exact set of 9 treatment combinations as another set of 9.} Provide proof (or, at least "support") for your answer.
If an operator can handle at most five calls per minute, what is the probability that the operator will be unable to handle the calls in any 1-minute period?
A box contains 10 chips. The chips are numbered 1 through 10. Otherwise, the chips are identical. From this box, we draw one chip at random, and record its value.
At the .01 significance level, is there a relationship between job pressure and age?
Find the expected number of passengers who wait for 1 unit of time or less and find P
To determine her blood pressure, Carolyn divides her day into three parts; morning, afternoon, and evening. She then measures her blood pressure at 4 randomly selected times during each part of the day. What type of sampling is used?
What is the 95.44 percent confidence interval for the estimated satisfaction level (8.5) in the benchmark survey? What is the 99.74 percent confidence interval?
The Central Limit Theorem states that the sampling distribution of means is:
She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?
When calculating correlation coefficient, what does a value of -2 indicate? Strong negative correlation, Weak negative correlation.
Perform a significance test to see if there is a relation between mortality and duration of employment in the group hired AFTER 1945 and report a p-value.
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