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The variance over the past 7 years, of the lengths (in inches) of a particular manufactured product has been 80. However, recent changes have given rise to the suspicion that this may no longer be the case. A recent sample of 15 such product lengths had a calculated sample standard deviation of 8 and mean of 9.4. Select the 95% confidence for the true variance of the product lengths. Use the appropriate table in the book.
Finds that their mean travel time is = 22.5 minutes. What are the null and alternative hypotheses for testing whether the true mean is different from 20 minutes?
The probability of a bulb lasting less than 2300 is .1573. The maximum probability of a bulb lasting less than 2300 hours should be only 5%. What must change specifically? How would that change be obtained practically?
There is significant evidence, alpha =0.05, to show that there is a difference in the proportions of patients who show improvement between treatments 1 and 2
Considering all of the day to day activities you are engaged in at work and in your personal lives, write a 200 (or more) word paper that describes at least three (3) different statistical usages that you see regularly.
The contingency table below shows the results of a random sample of 200 state representatives that was conducted to see whether their opinions on a bill are related to their party affiliation
A researcher selected a sample of 50 residents from each of 3 different cities to determine if they were willing to participate in a medical experiment. which of the following assumptions is NOT made for the F test for comparing 3 or more means?
In the study of age and systolic blood pressure of five randomly selected subjects, a researcher reported the following data.
A random sample of 80 students is selected for a particular study. What is the probability that the sample proportion (the proportion living in the dormitories) is between 0.30 and 0.50?
Welcome a woman taking the initiative in asking for a date. What is the probability that seven (7) of the men say NO.
Random sample of 150 viewers last night revealed 53 watched news on WNAE, 64 watched on WRRN, and 33 on WSPD. At .05 significance level, is there a difference in proportion of viewers watching three channels?
Suppose we compare two population means, μ 1 - μ 2 . In each case, indicate how μ 1 relates to μ 2 :
The results are shown below. Research question: Are the mean waiting times the same for emergency patients in these four hospitals? Use 0.05 for the significance level in making your decision.
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