Question 22>A psychiatrist is interested in finding a 98% confidence interval for the tics per hour exhibited bychildren with Tourette syndrome. The data below show the tics in an observed hour for 12randomly selected children with Tourette syndrome. Round answers to 3 decimal places wherepossible.10434912321012a. To compute the confidence interval use a v ? listribution.b. With 98% confidence the population meaber of tics per hour that children with Tourettesyndrome exhibit is betweenandc. If many groups of 12 randomly selected children with Tourete syndrome are observed, then adifferent confidence interval would be produced from each group. Aboutpercent ofthese confidence intervals will contain the true population mean number of tics per hour andaboutpercent will not contain the true population mean number of tics per hour.MacBook Air80DIIDDF3F4F5F6F7F8F9#3&34578

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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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Question 4 In a sample of 400 shops it was discovered that 136 of them sold carpets at below the list prices, which had been recommended by manufacturers. (a) Estimate the percentage of all carpet selling shops below list price. (b) Calculate the 95% confidence limits for this estimate.
QUESTION 3 The GPAs of nursing students (p1) were compared to GPAs of student-athletes (p2) were compared. Of a sample of 400 randomly and independently selected nursing students, 75% were placed on honor roll. Of a sample of 100 athletes, 80% of the students were placed on honor roll. Calculated the UPPER bound of the 95% confidence interval for the two samples. Round to the nearest hundredth.
Question # 14Males and females were asked about what they would do if they received a $100 bill by mail, addressed to their neighbour, but wrongly delivered to them. Would they return it to their neighbour? Of the 69 males sampled, 52 said "yes” and of the 131 females sampled, 120 said “yes.”a. Find a 95% confidence interval for the difference in proportions for males and females who said “yes.”b. Does the data indicate that the proportions that said “yes” are different for males and females at a 5% level of significance? Conduct the test using the p-value approach.
Question 13: For a confidence level of 80% with a sample size of 32, find the critical t value.
Question 1. In a study of vehicle speeds on a certain section of highway, a simple random sample of 25 cars resulted in a mean of 60.0 mph with a standard deviation of 4.0 mph. Construct a 90 percent confidence interval estimate of the mean speed (to nearest 0.1 mph) of all vehicles on that section of highway. [Note: Table A-3 might be helpful since the population standard deviation is unknown.] Question 2. Find the sample size required to estimate the mean IQ of all college students. Assume we want a 99 percent confidence level that the sample mean is within 2 IQ points of the true population mean. Also assume that the population standard deviation is 15 IQ points.
question 17 A smart phone manufacturer is interested in constructing a 95% confidence interval for the proportion of smart phones that break before the warranty expires. 81 of the 1662 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible. a. With 95% confidence the proportion of all smart phones that break before the warranty expires is between____ and _____. b. If many groups of 1662 randomly selected smart phones are selected, then a different confidence interval would be produced for each group. About _____ percent of these confidence intervals will contain the true population proportion of all smart phones that break before the warranty expires and about ____ percent will not contain the true population proportion. please solve blank
QUESTION 1 Suppose a sample of 200 local vendors is selected as part of a survey conducted by the Ministry of Trade and it is found that 145 of the local vendors make an average income in excess of $ 7 600 per month. a) Suppose that a 97% confidence interval estimate of the proportion of local vendors who make an average income less than N$ 7 600 per month is required. How large a sample should be taken if the desired margin of error is 5%? b) Suppose it has been established from past studies that 75% of local vendors make an average income in excess of N$ 7 600 per month. Use the p-value approach and conduct a hypothesis test at a 1% level of significance to determine whether the proportion of local vendors who make an average income in excess of N$ 7 600 per month differs from the historical level?
question 2 A simple random sample of 70 items from a population with 7 resulted in a sample mean of 35. If required, round your answers to two decimal places. a. Provide a 90 %confidence interval for the population mean. to b. Provide a 95% confidence interval for the population mean. to c. Provide a 99% confidence interval for the population mean.
QUESTION 16 In 2005, Health Canada claimed that 16.6% of Canadian adults are obese. A researcher wanted to check whether this percentage has increased in 2009. He randomly selected 160 Canadian adults and found 30 of them are obese. He wants to develop a 92% confidence interval for the obese percentage in 2009. Write down the critical value
Question 12 Using the data below, a.) generate a 95% confidence interval for the proportion of all patients with total cholesterol < 200 b.) how many patients would be required to ensure that a 95% confidence interval has a margin of error not exceeding 5%? New Drug: n=75 Placebo: n=75 Total Sample: n=150 Mean (SD) Total Serum Cholesterol 185.0 (24.5) 204.3 (21.8) 194.7 (23.2) % of patients with total cholesterol < 200 78.0%65.0%71.5%
Question 2 - (Please answer both a and b) A recent survey showed that from a sample of 500 packages delivered by a Postal Service, 480 were delivered on time. a) Construct a 95% confidence interval for the proportion of all packages that are delivered on time by the Postal Service. b) The manager of the Postal Services claims that 98 percent of their mail are delivered on time. Test at the 1% significance level to determine whether the true proportion is less than 98 percent.
Question 1 In a random sample of forty-eight 200-metre swims has a mean time of 3.12 minutes and a standard deviation of 0.09 minutes. (a) Construct the 89% confidence interval for the population mean time. (b) If all the other quantities remain the same, how does the indicated change affect the width of the confidence interval? (i) Increase in the sample size (ii) Increase in the level of confidence.

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