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If you test the null hypothesis at the 0.05 level of significance, what decision do you make using the critical value approach to hypothesis testing?
What is the difference between significance level and a p-value? Explain in detail.
Would you use the finite population correction factor in calculating the standard error of the mean? Explain. What is the probability that the sample mean age of the employees will be within 2 years
Is there evidence that the population mean amount is different from 8.17 ounces? (Use a 0.05 level of significance.)
Set up ahypothesis test to try to prove that the mean number ofhours studied at your school is different from the 14.6 hour benchmark reported by Business Week.
The mean weight of 120 7th graders is 75 lbs with a standard deviation of 6 lbs. Calculate the standard error of the mean.
What is the probability a random sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 502 on the Critical Reading part of the test?
If you use a 0.10 level of significance in a (two-tail) hypothesis test, what is your decision rule for rejecting a null hypothesis that the population mean is 500 if you use the Z test?
The number of ratios in each household in a country. Is this a population or sample? The ages of three families of people in an apartment building housing ten families. Is this population or sample?
The quality control manager at a lightbulb factory needs to determine whether the mean life of a large shipmentof lightbulbs is equal to the specified value of 375hours. State the null and alternati
Show the sampling distribution of the mean amount of Medicare spending for a sample of fifty 2003 enrollees. What is the probability the sample mean will be within $300 of the population mean?
For a cluster sample, the estimates of the halves came in at 58.75 and 58.35. Find the standard Error.
A town has 20, 000 registered voters, of whom 8,800 are democrats. A survey organization takes a simple random sample of 900 registered voters. The upper confidence limit of 95% interval for the sa
Give and describe an example of a nominal measurement scale.
Determine whether a statistical analysis should best involve examination of the population or of a sample in each case.
What are the advantages and disadvantages of graphical as opposed to numerical approaches to descriptive statistics?
What is the probability that the sample mean will be within $1000 of the population mean? How would the probability in part (c) change if the sample size were increased to 100?
Give and describe an example of an Ordinal measurement scale.
For each research situation described below, decide what statistical procedure would most likely be used to answer the research question posed. Assume all assumptions have been met for using the pro
The mean television viewing time for Americans is 15 hours per week (Money, November2003). What is the probability the sample mean will be within 1 hour of the population mean?
Give and describe an example of an Interval measurement scale.
What is the value of the standard error of the mean? What is the probability that the sample mean will be more than $27,175?
A nutritionist thinks the average person with an income below the poverty level gets less than the recommended daily allowance (RDA) of 800 mg of calcium.
Use a .05 significance level. Is this evidence that the average length of employment with the postal service has decreased from twenty years ago?
Increasing the alpha level from .01 to .05. Changing from a one-tailed test to a two-tailed test.