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Suppose we wish to know if there is a difference in choice of model based on comfort between population groups classified as under-weight, normal weight, or over-weight. To make this determination 600 people were classified in one of the three weight classes and then asked to select the most comfortable seat. The results are summarized in the following table.
Seat Preference
Weight Class: Model A Model B Model C
Under-Weight 100 40 50
Normal-Weight 90 70 60
Over-Weight 40 60 90
A) Write an appropriate null and alternative hypothesis.
B) Compute the expected frequency for the first cell in row one.
C) Test the null hypothesis at the 0.05 significance level. Make a decision to reject or fail to reject the null based on the p-value.
D) Draw a conclusion about the relationship between weight and type of seat based on comfort.
Calculate the mean and standard deviation for this set of data. Convert your answer back to dollars and cents and give the correlation value between number of beers consumed and BAC?
At the 0.05 level of significance, is there evidence that the population mean reimbursement was less than $100? Discuss the underlying assumptions of the test used in (a).
I could reach my target of 2800 at each of the 5 bookies, making my total profit for the month 14000, or hit my target of -12000 for a total loss of 60000 x 25% kickback, making the total loss for the month only 45000.
Verify value of t for the independent Variable, using formula. (That is, using formula in the Formula Sheet compute the t statistic , given data provided in the print out).
What percentage of workers spend more than 100 hours on the internet?A person is classified as a heavy user if he or she is in the upper 20% of usage. how many hours did a worker have to be logged on to the internet to be considered a heavy user?
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..
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. A Boeing 727 co-pilot collected 61 noise observations using a handheld sound meter. Noise level is defined as "Low" (under 88 ..
Find the mean, median, range and standard deviation for the 2005 returns and estimate with 99% confidence the average order in the city.
A jar containing 100,000 marbles. There are 6 colors of marbles in the jar and they are present at frequencies of 2%, 2%, 4%, 10%, 57%, 25%.
Which of the given properties doesn't apply to theoretical normal distribution?
Suppose that Total Revenue = 200Q and Total Cost = 80 + 50Q where Q, the quantity sold, is a random variable with expected value 20 and variance 4.
Two manufacturing facilities produce 1280 × 1024 LED (light-emitting diode) displays. Twelve displays are chosen at random from each lab, and the number of bad pixels is noted for each display.
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