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The time needed to complete a final examination in a particular college course is normally distributed with a mean of 79 minutes and a standard deviation of 8 minutes. Answer the following questions.
1. What is the probability of completing the exam in one hour or less (to 4 decimals)?
.0088
2. What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes (to 4 decimals)?
.2998
3. Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time (to the nearest whole number)?
Of 346 vending machines tested, 12 are found to be defective. Construct the 98 % confidence interval for the proportion of all defective vending machines.
At.05 level of significance, is there sufficient evidence to conclude that difference exists between proportion of cats and proportion of dogs which sleep more than 10 hours per day?
If an analysis of variance is used for the following data, what would be the effect of changing the value of M1 to 20?
Data are recorded on effects of each drug. Is research division by using dependent or independent samples? Explain why?
a memory researcher shows each study participant a list of words on a computer with some participants seeing words that
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A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
data from a national survey of college students living away from home indicate that freshman go home an average of 1.7
Make up a scatter diagram with 10 dots for each of the following situations: (a) perfect positive linear correlation, (b) large but not perfect positive linear correlation,
A pie company claims that the number of pies it sells daily is 1600. The President of the company wants to test the accuracy of this claim. He finds a random sample of 36 days' sales shows that the average daily sales were 1500 pies.
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