An article reported that for a sample of 48 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO2 level (ppm) was 654.16, and the sample standard deviation was 162. (a) Calculate and interpret a 95% (two-sided) confidence interval for true average CO2 level in the population of all homes from which the sample was selected. (Round your answers to two decimal places.) (___,____) ppm

An article reported that for a sample of 48 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO2 level (ppm) was 654.16, and the sample standard deviation was 162. (a) Calculate and interpret a 95% (two-sided) confidence interval for true average CO2 level in the population of all homes from which the sample was selected. (Round your answers to two decimal places.) (_,__) ppm

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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Suppose that in a large population of students, the mean amount of sleep the previous night was μ = 7.2 hours and the standard deviation was σ = 1.6 hours. Consider randomly selected samples of n = 200 students. (a) Use the Empirical Rule to find values that fill in the blanks at the end of the following sentence. (Round your answers to three decimal places.) For 68% of all randomly selected samples of n = 200 students, the mean amount of sleep the previous night will be between and hours. (b) Use the Empirical Rule to fill in the blanks at the end of the following sentence. (Round your answers to three decimal places.) For 95% of all randomly selected samples of n = 200 students, the mean amount of sleep will be between
Question 5 Assume that a sample is used to estimate a population mean p. Find the 90% confidence interval for a sample of size 71 with a mean of 57.2 and a standard deviation of 20.7. Enter your answer as an open- interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). 90% C.I. %3D Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Submit Question
Question 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 9: compute a 95% confidence interval for the average blood pressure range of any individual that will take the blood pressure medication.
Question 10 く Suppose that we are studying the amount of time customers wait in line at the checkout at the Gap and Old Navy. The avérage wait time at both stores is five minutes. At the Gap, the standard deviation for the wait time is 2 minutes; at Old Navy the standard deviation for the wait time is 5 minutes. Because Old Navy has a higher standard deviation, we know that there is Select an answer v in the wait times at Old Navy. Overall, wait times at Old Navy are Select an answer v from the average; wait times at the Gap are Select an answer v near the average.
3.3.15 Use z scores to compare the given values. Based on sample data, newborn males have weights with a mean of 3293.7 g and a standard deviation of 551.3 g. Newborn females have weights with a mean of 3000.6 g and a standard deviation of 590.5 g Who has the weight that is more extreme relative to the group from which they came; a male who weighs 1700 g or a female who weighs 1700 g? V has the weight that is more extreme. Since the z score for the male is z= and the z score for the female isz= the (Round to two decimal places.)
Question 19 Provide an appropriate response. A radio station claims that the amount of advertising per hour of broadcast time has an average of 13 minutes and a standard deviation equal to 2.3 minutes. You listen to the radio station for 1 hour, at a randomly selected time, and carefully observe that the amount of advertising time is equal to 11 minutes. Calculate the z-score for this amount of advertising time. O z= 0.67 O z= -0.67 z= 0.87 O z= -0.87 A Click Submit to complete this assessment. < Question 19 of 19 Save and Submit 5:33 PM arch 3/25/2021 PrtScn Home 19 End VI0 PgUp PoDn K
QUESTION 17 The amount of time a bank teller spends with each customer has a population mean of 3 minutes and a standard deviation of 0.40 minute. A random sample of 64 customers is selected. There is a 95% chance that the sample mean is less than how many minutes? Round your answer to three decimal places. QUESTION 18 An automotive repair shop has determined that the service time on an automobile is normally distributed with a mean of 100 minutes and a standard deviation of 15 minutes. What is the probability that a random sample of 9 automotive services will have a mean service time greater than 115 minutes? Round your answer to four decimal places. QUESTION 19 Salaries of computer engineers in UAE are strongly right skewed with mean AED 34000 and standard deviation AED 4500. A random sample of 9 computer engineers is taken. What is the probability that the average salary of the sample is more than AED 32000? 0.9088 0.0912 Not enough information 0.1545
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Question 3 Assume the average teenager sends 250 text messages per day. You sample 28 local teenagers and find that they send 232 messages per day with a standard deviation (calculated with the correction) of 64 messages per day. What decision would you make based on these data? Fail to reject the null hypothesis; we cannot conclude that there is any difference between our sample and the nation. Fail to reject the null hypothesis; the local teenagers text more than the national average. Reject the null hypothesis; there is no evidence of a difference between our sample and the nation. Reject the null hypothesis; our sample sends significantly fewer text messages than the national average.
Question 8 A factory makes bath bombs. According to the factory, the weight of a bath bomb has a mean of 4.20 oz and standard deviation of 0.5 oz. To verify whether the bath bomb indeed has a mean weight of 4.20 oz, we sampled 144 bath bombs and found a sample mean of 4.15 oz. Please compute the p-value for the hypothesis test that verifies whether the mean weight of the soap equals 4.20 oz or not: Please round your result to 2 decimal places. Answer (Correctly):____________________-