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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 serviced and quality should now be improved.
b. In a speech during her campaign for reelection, a Republican candidate claims that 55% of registered 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 sample of 800 voters revealed that 52 of them would vote for a specific issue. create and interpret a 95 confidence
A recent survey of 50 executives who were laid off durning a recent recession revealed it took a mean of 26 weeks for them to find another position. The standard deviation of the sample was 6.2 weeks. Construct a 95 percent confidence interval for..
find an online report of a simple research study that includes statistics. you must include website link to the report
The lengths of Atlantic croaker fishes are normally distributed, with a mean of 9 inches and a standard deviation of 2.56 inches. An Atlantic croaker fish is randomly selected.
Find a 96% confidence interval for the true percentage of all households that have central air conditioning. Write a sentence that interprets this interval.
x is a normally distributed random variable with a mean of 5.0. find the standard deviation of the distribution if
Give a mathematical expression for the probability density function of driving distance.
Describe the difference between sample and a sampling distribution. Your reply must be in complete sentences and you may use sketches to help you.
The sample standard deviation is 10 lbs. We would like to decide if there is enough evidence to establish that the average weight for the population of lawnmowers is greater than 100 lbs.
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. What is the standard deviation for the sample proportion?
The distribution of tensile strength is normal, with a standard deviation of 80 kg/cm2. Find the variable sampling plan and describe its operation.
consider an arbitrary data set x1 y1 x2 y2...xn yn. let xbar and ybar denote the respective sample means for the
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