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The director of admissions at the University College is concerned about the high cost of textbooks for the students each semester.
A sample of 75 students enrolled in the university indicates that X (bar) = $285.4 and s = $42.20
a. Using the 0.05 level of significance, is there evidence that the population mean is above $300?b. What is your answer in (a) if s= $90 and the 0.10 level of significance is used?c. What is your answer in (a) if X (bar) = $310.10 and s= $40.20?d. Based on the information in part (a), what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?
A food processor is concerned that the 16 oz. can of sliced pineapple is being overfilled. The quality control department took a random sample of 50 cans and found that the arithmatic mean weight was 16.05 oz.
In 2002 the Supreme Court ruled that schools could require random drug tests of students participating in competitive after-school activities such as athletics.
Suppose that the population of heights of female college students is approximately normally distributed with mean m of 66.24 inches and standard deviation s of 5.07 inches.
A normal population has a mean of 60 and a standard deviation of 3. You select a sample of 36. Compute the probability the sample mean is (Round z values to 2 decimal places and final answers to 4 decimal places):
A random sample of 51 observations was selected from a normally distributed population. The sample mean was xbar = 88.6, and the sample variance was s2 = 38.2.
A suburban hotel derives its gross income from its hotel and restaurant operations. The owners are interested in the relationship between the number of rooms occupied on a nightly basis and the revenue per day in the restaurant.
Which of the variables below do you think will be roughly normally distributed? Please select all that apply.
Find the probability of getting a queen and a spade.
What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
What is the difference between resampling (bootstrapping) and double sampling in research? Is there any difference or is the same? Please explain your response?
What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different?
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
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