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Find the critical value from Table L for the rank correlation coefficient, given sample size n=12 and alpha=0.02
Find a 90% confidence interval for the difference in average absorption times for the two drugs. Does it appear that one drug is absorbed faster than the other (at the 90% level)? Explain
A random sample of 12 men and 12 women were asked to report the number of hours they watched television on a Wednesday evening. If a researcher wants to test the hypothesis that there is no differen
Imagine that you are taking a subsample of 200 state residents. What is the probability that your sample mean is between $71,000 and $77,531? For this same sample size, what is the probability that
Listed below are the heights of candidates who won presidential elections and the heights of the candidates with the next highest number of votes. The data are in chronological order, so the corresp
Construct a 80% confidence interval for the mean purchases of all customers, assuming that assumptions and coditions for cofidence interval have been met. (What is the confidence interval)?
Listed below are actual high temperatures and high temperatures that were forcast one day earlier. Construct a 95% confidence interval estimate of the mean difference between actual and forcast temp
Construct a 95% confidence interval for the mean age of all customers, assuming that assumptions and coditions for cofidence interval have been met. (What is the confidence interval)?
Find a 99% confidence interval for the difference in the proportion p1 - p2 of the portfolios meeting target goals managed by Kendra compared with those managed by Lisa.
The mean time between failures (MTBF) is the expected time between a repair and the next failure of a component. MTBF at this time in testing =_______hours
What is the level of significance? State the null and alternate hypothesis. Will you use a left tailed, right tailed, or two tailed test? Identify the sampling distribution you will use: the standar
The square footages and sale prices (in thousands of dollars) of seven homes are shown in the table below. Use this information to answer the following questions.
Find (or estimate) the P value. Sektch the sampling distribution and show the area corresponding to the P value. (alternate method: Find the critical value(s) and sketch the critical regions and sam
What is the approximate probability that the total time spent on the calls will be greater than 234 minutes? Give your answer to four decimal places. Use the standard deviation as you entered it abo
The Economic Policy Institute periodically issues reports on wages of entry level workers. The Institute reported that entry level wages for male college graduates were $21.68 per hour and for femal
Which of the following values are not needed to construct a 95% prediction interval for a value of y?
Does these data suggest the side effects of the drug and gender are related? Use a=0.05. Identify the parameters, null hypothesis, alternative hypothesis, test statistics, rejection region and conc
Over the last five years in Pa. The variance of new home construction costs has been $108,000. Over the same period of time, based on a sample of 60 new homes , the variance of construction costs in
A study seeks to determine the effect of temperature on the heart rate of pythons. Data are as follows
Identify the random variable along with the measurement scale. Is there evidence to support the claim that the shift exceeded minimal expectations?
Identify the random variable along with the measurement scale. Can we conclude the median cholesterol levels of the population are greater than 200?
The results of a mathematics placement exam at two different campuses of Mercy College follow:
Using two independent samples, we test for a hypothesized difference between two population means. The population standard deviations are unknown but assumed equal. The number in the first sample is
What is the decision rule? Compute the value of the test statistic. What is your decision regarding the null hypothosis?
At the .025 level, has Holdlonger increased the shelf life of the chlorine? Estimate the p-value. State the null hypothesis and the alternate hypothesis. State the decision rule for .025 significance