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ONE SAMPLE HYPOTHESIS TEST FOR MEAN: A bowler who has averaged 196 pins in the past year is asked to experiment with a ball made of a new kind of material. If he rolls 25 games with the new ball, averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball has improved his game?
a) Direction = UPPER TAILED / LOWER TAILED / 2-TAILED
b) P-value = ________________
c) REJECT THE NULL or DO NOT REJECT THE NULL?
d) Can we conclude the ball improved his game? YES or NO
Find the equation of the regression line. What is the predicted value when x = 4? Is the correlation significant at 5% significance level (95% confidence level)? Why or why not?
Find the probability that a random sample of 50 customers will take between 90 and 112.5 minutes to complete all their transactions. That is, find the probability that will be between 1.8 and 2.25 minutes.
In 35 of their stores they sold on the average 430 suits per year with a population standard deviation of 40. What is the test value for their claim?
How do I construct an example where I would be able to apply the concept of expected value to a problem (e.g. a financial investment problem would be a great way to demonstrate how various stocks in a portfolio produce a weighted average of the ov..
What is the difference between strong negative and strong positive correlation? What does zero correlation tell you? Can you share a relationship between two variables that is typically negative?
A manufacturer claims that he makes light bulbs each of which has a 0.9 probability of operating successfully when plugged in.
Quality control inspectors randomly select 16 parts, weigh each, and then compute the sample average weight for the 16 parts. The probability that the mean weight of these 16 parts is more than 41 grams or less than 39 grams is?
What is the estimated index of satisfaction for a person who first married at 18, has an annual income of $26,500, has three children living, has assets of $156,000, has an index of health status.
A survey of magazine subscribers showed that 55.8% rented a car during the last 12 months for business reasons, 44% rented a car for personal reasons, and 25% rented a car for both business and personal reasons.
Suppose that the cars have been categorized according to whether the car needs warranty-related repair (yes or no) and the country in which the company manufacturing the car is based
Would the null hypothesis be accepted or rejected in this case?
A store selling newspapers orders only x=4 of a certain newspaper because the manager does not get many calls for that publication. If the number of requests per day follows a Poisson distribution with mean 3.
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