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For each of the following situations, determine whether a one-tail test or a two-tail test would be appropriate. Describe the test, including the null and alternative hypotheses, then explain your reasoning in selecting it.
a. A machine that has not been serviced for several months is producing output in which 5% of the items are defective. The machine has just been ser- viced and quality should now be improved.
b. In a speech during her campaign for reelection, a Republican candidate claims that 55% of regis- tered Democrats in her county intend to vote for her.
c. Of those who have bought a new car in the past, a dealer has found that 70% experience three or more mechanical problems in the first four months of ownership. Unhappy with this percentage, the dealer has heavily revised the procedure by which predelivery mechanical checks are carried out.
a manufacturer has determined that for every 1000 units it produces 3 will be faulty. what is the probability that an
Analysis of variance (ANOVA) is used to determine if there is a difference between the means of different populations. This is an example from a student in Prescott Arizona.
Your new project is coming in over budget and requires a cost change through the cost change control system. The cost variance was projected using which of the following tools and techniques?
In a different regression analysis, 40% of the variance was explained. The sum of squares total is 1000. What is the sum of squares of the predicted values?
sally inc. surverys customer satisfaction. of 144 customers and finds that 108 are satisfied.1 what is the point
for a particular instant lottery the bettor can determine immediately whether a purchased ticket is a winning ticket.
suppose that you are interested in determining the cost of tuition and fees at universities in the united states.
a young boy is a budding entrepreneur and decides to start his career by selling sandwiches in an office building. he
1. What is the term used to identify the risk that the client's financial statements may be materially false and misleading?
a bottled water plant utilizes a production process designed to fill bottles with 20 ounces of water. the population of
Construct a 95% confidence interval for the population standard deviation. Test at the 5% level of significance that whether the variance of length of pipes is significantly different from the standards.
suppose the coach of the football team wants to estimate the proportion of the population of fans who support his
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