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In a research report on the effect of moisture on a certain kind of composite material, it is reported that in 80% of cases the effect is minimal, in 15% of cases the effect is strong and in the remaining 5% of cases the effect is severe. An experiment tested these clains by subjecting 800 samples of the composite material to moisture.
a) What are the hypotheses needed to test the clain of the report?
b) The results from the sample given below. Complete the expected counts for the hypothesis test.
Effect
Minimal
Strong
Severe
Observed Counts
619
124
57
Expected
c) Calculate the test statistic.
d) What are the degrees of freedom for this test? DF=
e) The experimenter reported a p-value=0.01789. What can you conclude?
The average stock price for companies making up the S&P 500 is $40, and the standard deviation is $10. Assume the stock prices are normally distributed. What is the probability a company will have a stock price less than $33.
An investment counselor would like to meet with 12 of his clients on Monday, but he has time for only 8 appointments. How many different combinations of the clients could be considered for inclusion into his limited schedule for that day?
suppose 80 of the college football fans root for the home team. if 400 fans who attended a college football game last
A regression equation was computed to be Y'=35+ 6X. The value of the 35 indicates that
The "average" (mean) tire wore out at 41,000 miles, and the standard deviation was 4000 miles. Approximately what percent of the tires are likely to wear out before 40,200 miles?
chicagos treadway tires dealer must order tires from its national warehouse. it costs 10000 to place an order and 400
A study was conducted of the annual incomes of beginning probation officers in metropolitan areas of less than 100,000 population and in metropolitan areas having more than 500,000 population.
Which option produces the smallest risk of a Type I error?
in exponential smoothing models the value of the smoothing constant may be any number between .a -1 and 1b -5 and 5c 0
Determine if your survey questions are appropriate for researching your business problem, and explain why they are. Identify the level of measurement being used for each of your survey questions.
A sample of 50 retirees is drawn at random from a normal population whose mean age and standard deviation are 75 and 6 years, respectively.
59% identify NASCAR as their favorite type of racing. Suppose four auto racing fans are randomly selected. What is the probability that all four have NASCAR as their favorite?
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