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The design tolerance thickness for an automotive part is 55 mm to 65 mm. If the process mean thickness is 61 with a standard deviation of 2.3 mm, then what percentage of the sheets will be acceptable? (i.e. What percentage will fall within the design tolerances?) Assume that the distribution of these parts is normally distributed. Diagram required.
Out of forty students, 14 are taking English Composition and 29 are taking Chemistry. If five students are in both classes, how many students are in neither class? How many are ineither class?
What is the probability that the sum of their scores exceeds 1200 and probability that the average of the scores of all 400 student
A researcher wants to collect data about the study habits of sophomores at Harmond University. From the sophomore class of 2,300 students, she wants to collect a sample of 70 students. Which of the following sampling methods will yield the most re..
Test whether the mean weight is less than 10 pounds. Use P-value approach.
An instructor claims the average time to take a statistics test is greater than 39 min. As, if a sample of 33 students took 43 min. is the instructor's claim true?
The probability that house sales will increase in the next 6 months is estimated to be 0.25. The probability that the interest rates on housing loans will go up in the same period is estimated to be 0.74. The probability that house sales or intere..
Multiple comparison procedures are going to be done using the Bonferroni method with = 0.05. The value of t** is 2.4667. Which of the following is the appropriate conclusion from carrying out these multiple comparisons?
She then selects a sample of 102 football players and finds that their average math SAT is 460. Use alpha =.01 to perform the appropriate hypothesis test.
The economists in the Obama administration suggested that the stimulus package that they recommended in early 2008 would keep unemployment under eight percent.
What is the probability that 0, 1, 2, or 3 hypertensives will be identi ed in such sibships if the hypertensive status of 2 siblings in the same family are independent events?
A researcher has a series of Likert-scale items and a measure of frequency of absenteeism. He uses each of the Likert-scaled items in a separate bivariate correlation with absenteeism without testing for the assumptions of linear relationships. Is th..
Critically discuss the purpose of developing a frequency distribution? What is the relationship between the relative frequency and the cumulative frequency? Could a frequency distribution contain qualitative data? Why?
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