The group of students had a test on Statistics. The following student’s blood pressure results are given in the table before and after the test: Student 1 2 3 4 5 6 7 8 before 70 74 73 80 74 85 81 75 after 72 78 75 79 84 88 82 78 а) Find 95% confidence interval for the μd - difference of the student’s blood pressure results before and after the test, b) Do the

The group of students had a test on Statistics. The following student’s blood pressure results are given in the table before and after the test: Student 1 2 3 4 5 6 7 8 before 70 74 73 80 74 85 81 75 after 72 78 75 79 84 88 82 78 а) Find 95% confidence interval for the μd - difference of the student’s blood pressure results before and after the test, b) Do the

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A study of 420 comma 026 cell phone users found that 140 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0434 % for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. b. Do cell phone users appear to have a rate of cancer of the brain or nervous system that is different from the rate of such cancer among those not using cell phones? Why or why not?
On the Navajo Reservation, a random sample of 222 permanent dwellings in the Fort Defiance region showed that 56 were traditional Navajo hogans. In the Indian Wells region, a random sample of 141 permanent dwellings showed that 17 were traditional hogans. Let p1 be the population proportion of all traditional hogans in the Fort Defiance region, and let p2 be the population proportion of all traditional hogans in the Indian Wells region. Find a 90% confidence interval for p1 − p2. (Round your answer to three decimal places.) lower limit upper limit
On the Navajo Reservation, a random sample of 214 permanent dwellings in the Fort Defiance region showed that 58 were traditional Navajo hogans. In the Indian Wells region, a random sample of 151 permanent dwellings showed that 19 were traditional hogans. Let p1 be the population proportion of all traditional hogans in the Fort Defiance region, and let p2 be the population proportion of all traditional hogans in the Indian Wells region. (a) Find a 90% confidence interval for p1 – p2. (Use 3 decimal places.) lower limit upper limit
A survey of an urban university (population of 35,540) showed that 840 of 1,300 students sampled supported a fee increase to fund improvements to the student recreation center. Reference: Ref 2 Using the 95% level of confidence, what is the confidence interval for the proportion of students supporting the fee increase? Group of answer choices [0.767, 0.815] [0.612, 0.580] [0.771, 0.811] [0.620, 0.672]
A sample of size 25 was taken from a very large population. Sample statistics, x¯ and s, were used to find that the 95% confidence interval was (138.616, 163.384). x¯= s=
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Gosset used the following data set, which gives the additional sleep in hours obtained by a sample of 10 patients using laevo-hysocyamine hydrobromide. 1.9, 0.8, 1.1, 0.1, −0.1, 4.4, 5.5, 1.6, 4.6, 3.4 a). Obtain and interpret a 95% conﬁdence interval for the addi- tional sleep that would be obtained on average for all people using laevohysocyamine hydrobromide. b). Was the drug effective in increasing sleep? Explain your answer.
In a survey of 500 potential jurors, one study found that 350 were regular watchers of at least one crime-scene forensics television series. (a) Assuming that it is reasonable to regard this sample of 500 potential jurors as representative of potential jurors in the United States, use the given information to construct a 95% confidence interval for the true proportion of potential jurors who regularly watch at least one crime-scene investigation series. (Give the answer to three decimal places.)( , )
On the Navajo Reservation, a random sample of 210 permanent dwellings in the Fort Defiance region showed that 63 were traditional Navajo hogans. In the Indian Wells region, a random sample of 152 permanent dwellings showed that 22 were traditional hogans. Let p1 be the population proportion of all traditional hogans in the Fort Defiance region, and let p2 be the population proportion of all traditional hogans in the Indian Wells region. (a) Find a 99% confidence interval for p1 – p2. (Round your answers to three decimal places.) lower limit upper limit (b) Examine the confidence interval and comment on its meaning. Does it include numbers that are all positive? all negative? mixed? What if it is hypothesized that Navajo who follow the traditional culture of their people tend to occupy hogans? Comment on the confidence interval for p1 – p2 in this context. Because the interval contains only positive numbers, we can say that there is a higher proportion of hogans in the Fort…
In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained: 0.06, 0.11, 0.16, 0.15, 0.14, 0.08, 0.15 (based on data from the Environmental Protection Agency). Assuming that this sample is representative of the cars in use, construct a 95% confidence interval estimate of the mean amount of nitrogen-oxide emission for all cars.