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A professor believes that the mean mark of final exam (out of 100) of his subject is more than 60. Accordingly, he selects 100 students at random and finds that the average mark to be 63 and the standard deviation is 15. To see if his belief is substantiated, conduct the test at a suitable significant level. State the assumptions made. see if his belief is substantiated, conduct the test at a suitable significant level. State the assumptions made.
What is the probability that all three students pick exactly the same card?
Using the following number of flirtations actions in the 4 hour period, test the "null hypothesis'
What is the probability that the mean life-span of a sample of 64 randomly selected bulbs will exceed 727 hours?
He measures the heights of 25 men from this century and finds the mean and standard deviation for his sample.
what percent of the total number of seeds germinated?
Discuss whether the percent distribution of the cross-tab and chi-square supports/does not support the researcher's hypothesis.
Describe the difference between sample and a sampling distribution. Your reply must be in complete sentences and you may use sketches to help you.
When the names of all the students at Omega University were dropped to a fishbowl, they would include:
A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes.
Explain the logic of what you have done, writing as if you are speaking to someone who has never heard of correlation (but who does understand the mean, deviation scores, and hypothesis testing);
The estimated simple linear regression equation minimizes the sum of the squared deviations between each value of Y and the line.
If campaign can be expected to also to rise the probability of best case scenario to 0.4, is it a good investment.
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