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In order to fairly set flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to replace a fuel pump in a car. Assume that the standard deviation of all times is 30 minutes.
a. Determine the minimum sample size he must select if he wants to be 90% confident that the true average time is within 10 minutes of the sample average?
b. Repeat part (a) using a 95% confidence interval.(a) Which level of confidence requires a larger sample size? Explain.
To determine whether there exists mean difference among the groups:
What can be completed to remedy multicollinearity.
A family has 5 children and 1 of them is a boy the percentage of boy is 1/5, or .020. Do you think one could say the chances of any woman having a boy would be 1/5?
Suppose a bookie will give you $6 for every $1 you risk if you pick the winner in 3 ballgames. For every $1 bet, you either lose $1 or gain $6. What is the bookies expected earnings per dollar wagered?
Which of the following is not true about the student's t distribution? It has more area in the tails and less in the center than does the normal distribution.
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
Is this statistically significant evidence that candidate has sufficient valid signatures overall? Describe.
According to study done by Nick Wilson of Otago University, the probability a randomly selected individual will not cover his or her mouth when sneezing was 0.267. Suppose you sit on a mall bench and observe 200 people pass by as they sneeze.
What are some examples of each of the trend types (Secular/Linear)? What external factors might affect each of the different types of trending?
To test whether there is any association between two variables using Chi-Square test for independence.
In a survey about soft drinks it was found that 5% of the respondents like diet soft drinks. 12% of them liked the brand Coke. Of all the Diet soda drinkers 40% liked Coke.
A computer manufacturer offers a help line that purchasers can call for help 24 hours a day, 7 days a week. Clearing these calls for help in a timely fashion is important to the company's image.
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