Question 7: 120 people have rated a new wine on a taste scale of 0 to 100. The result of the survey is shown on this worksheet. Develop a 99% confidence interval for the population standard deviation of taste ratings in the previous question.
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Q: Find a 99% interval for the previous problem. (54.20, 65.80) O (50.40, 69.60) (51.36, 68.64) (54.48,…
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- QUESTION 11 The price of iPhone 13 pro max is recorded at a random sample of 40 electronics stores in UAE. The resulting 90% confidence interval for the mean price of IPhone 13 pro max was (3109 Dhs, 3892 Dhs). Find the margin of error (E) of the 90% confidence interval. Round your answer to one decimal place.Question 8 > The body temperatures in degrees Fahrenheit of a sample of adults in one small town are: 96.4 97.9 96.3 98.6 97.4 98.1 97.5 99.2 97.8 97.7 Assume body temperatures of adults are normally distributed. Based on this data, find the 95% confidence interval of the mean body temperature of adults in the town. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places. Assume the data is from a normally distributed population. 95% C.I. =Question 2 You want to check if the sample size your manager has for advertising spending is big enough. Calculate the sample size for a 90% confidence interval if the standard deviation is 10 and the allowed error is 3. Round to a whole (ie no decimals).
- Question 5: give the hypotheses.Question 1. Suppose that a committee is studying whether or not there is waste of time in our judicial system. It is interested in the average amount of time individuals waste at the courthouse waiting to be called for service. The committee randomly surveyed 81 people. The sample average was 8 hours with a sample standard deviation of 4 hours. (a) Construct a 95% confidence interval for the population average time wasted and write the interpretation (Sketch the graph). (b) Which distribution you used for this problem? Explain your choice.QUESTION 2 A research study reported a 95% confidence interval for the mean time of hip surgeries based on a sample of 91 patients as (116 minutes, 138 minutes). Which of the following statements is correct about the given interval? A. Incorrect B. Correct The mean time of hip surgeries of the 91 patients in the selected sample falls between 116 and 138 minutes. ✓The mean time of hip surgeries of any sample of 91 patients will fall between 116 and 138 minutes. 95% of hip surgeries take between 116 and 138 minutes. We are 95% confident that the mean time of hip surgeries will be between 116 and 138 minutes.
- Question 26: give the test statisticQuestion 5 A common claim is that garlic lowers cholesterol levels. In a test of the effectiveness of garlic, 45 subjects were treated with doses of raw garlic, and their cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/mL) have a mean of 4.94 mg/mL and a standard deviation of 18.51 mg/mL. Construct a 95% confidence interval for the average net change in LDL cholesterol after the garlic treatment. i. Procedure: Select an answer Select an answer One proportion Z procedure One mean T procedure One mean Z procedure One variance x² procedure ii. Assumptions: (select everything that applies) Simple random sample Sample size is greater than 30 Population standard deviation is unknown Population standard deviation is known The number of positive and negative responses ar Normal population iii. Unknown parameter: Select an answer Select an answer u, population mean o², population variance p, population proportionQuestion 2: A student safety advocacy group believes that drivers are speeding down Manhattan College Blvd. To prove their point, they wish to college vehicle speed data. Previous research has shown that the standard deviation of vehicle speeds on this functional class of roads is 7.00 mph. A. How many vehicles will the group need to sample to determine the 50h percentile speed if they wish to be 95.5% confident in their results plus or minus 3.00 mph? B. How does the 50th percentile required sample size change if we are concerned about the 85th percentile? C. How does the 50h percentile required sample change if we want the results to be accurate to plus or minus 1.5 mph?
- Question 21: give the conclusion.Question 7: can we use this to determine a 95% confidence interval for the average study time of All students for final exams? Consider a small scale example, comparing how temperatures have changed in the US from 1968 to 2008. The daily high temperature reading on January 1 was collected in 1968 and 2008 for 51 randomly selected locations in the continental US. The locations are the same for both years. The difference between the two readings (temperature in 2008 - temperature in 1968) was calculated for each of the 51 different locations. The average of these 51 values was 1.24 degrees with a standard deviation of 4.25 degrees. We are interested in determining whether this provides strong evidence of temperature warming in the continental US. (Does the data provide evidence that the true mean temperature is greater in 2008 than in 1968?) Justify by using a confidence interval or a hypothesis test with α = 0.05. What type of error are you in danger of making?