A certified mechanic was timed for the repair of an automobile on 14 separate occasions. Over the same period a trainee mechanic was timed for the repair of a similar automobile. The times in minutes are given below. Certified 344 276 257 334 267 164 222 343 212 175 211 311 209 188           Trainee 222 342 178 234 398 232 377 211 309 190 351 343 177 269             a. Calculate a 99% confidence interval for the mean time taken to repair the automobile by the (i) certified mechanic (ii) the trainee mechanic

Q: Find the standard deviation of the data: 22, 29, 21, 24, 27, 28, 25, 36 O a. 4.8 O b. 2.8 O C. 4.2 O…

A:

Q: The weekly salaries (in dollars) for some registered nurses are listed below: 774   446  1019  795…

A: Given data,   774   446  1019  795  908  667  446  960     The objective is to find the mean,…

Q: The height, in inches, of each student in Megan's algebra class is shown. 72 72 71 70 70 70 69 67 66…

A: Solution: First find the all the measures without adding 77 into the given data. Given data is 72…

Q: is an expert in wildlife conservation. in his book The Woll in the Southwest: The Making of an…

A: A t-test is a type of inferential statistic used to determine if there is a significant difference…

Q: based on the data set below , what is the standard deviation? 25      27      31      33      26…

A: The given data is, 25, 27, 31, 33, 26, 28, 38, 41, 24, 32, 35 and 40. Mean: Thus, the mean is…

Q: Using your calculator, find the range and standard deviation, round to two decimals places: The…

A: Given data: Sample of 24 children

Q: The following data represent the number of people aged 25 to 64 years covered by health insurance​…

A: Mean is one of the measures of central tendency and is the average value of the data set which tells…

Q: For the set of scores 5,10,10,15,25 calulate the mean, median,mode,range variance, and standard…

A: We have given that data  5,10,10,15,25 Mean = sum of all observations/total number of observations…

Q: You work for a consumer watchdog publication and are testing the advertising claims of a tire…

A: Formula for standard deviation is, s=x-x¯2n-1 Let us define xi as the given data values.

Q: You may need to use the appropriate appendix table or technology to answer this question. According…

A: Note: As per the guidelines, only first three sub-parts have been solved. Given: The sample…

Q: Find the mean and the standard deviation of the data. 48 22 34 26 27 37 20

A: From the provided information, Sample size (n) = 7 Data is given as follow: 48      22     34     26…

Q: Calculate the sample standard deviation of the data shown. Round to two 17 22 25 15 19 13 24 sample…

A:

Q: The weight in pounds of a group of watermelons is given below: 6.3, 5.2, 7.8, 4.9, 8.1, 7.2, 5.8,…

A:

Q: The time spent by a teacher at work in the holidays is normally distributed with a mean of 20 hours…

A: Given: Mean = 20 Standard deviation = 5

Q: After examining a child at his​ 2-year checkup, the​ boy's pediatrician said that the​ z-score for…

A: The z score is given by Z = 1.31

Q: In designing a work desk, it is found that males have sitting knee heights with a mean of 21.2 in,…

A: From the provided information, Mean (µ) = 21.1 Standard deviation (σ) = 2.2

Q: The number of regular season wins for 10 college football teams in a given season are given below:…

A: x x2 2 4 10 100 15 225 5 25 13 169 10 100 15 225 9 81 7 49 4 16     ∑x=90…

Q: Using your calculator, find the range and standard deviation, round to two decimals places: The…

A: From the provided information, Maximum value of data set = 94 Minimum value of data set = 19 The…

Q: (e) How good was the Denver Broncos' 2013 NFL season compared to the rest of the football teams that…

A: We have to find out z score..

Q: The number of people standing in the line to vote at the last Presidential Election at 7:00 P.M. was…

A: In statistics, three measures of central tendency are widely used. These three measures are also…

Q: An evaluation team set out to survey the cost of malaria drugs in two urban areas. The following…

A: Note: Hey there! Thank you for the question. As you have posted a question with more than 3…

Q: Find the standard deviation of the following dataset (round to the nearest hundredth). 25, 37, 17,…

A: See the attachment

Q: We are going to calculate the standard deviation for the following set of sample data. 8 15 11 6. 3…

A: Given data, 8,5,11,9,3 standard deviation=?

Q: The following data gives the number of daily customers of a small eatery recorded for 20 days. 29,…

A: Given: Sample size n = 20 Formula Used: Sample mean X = ∑Xin Sample standard deviation S = ∑Xi-X2n-1…

Q: Find the mean and standard deviation for the individualized instruction scores. Scores…

A:

Q: You may need to use the appropriate appendix table or technology to answer this question. According…

A: Note: As per the guidelines, solution of 3 subparts are provided. Given information, Price for a…

Q: The Highway Patrol, using radar, checked the speeds (in mph) of 30 passing motorists at a…

A: In statistics there are two types of measures namely measures of central tendency and…

Q: You may need to use the appropriate appendix table or technology to answer this question. According…

A: From the given information, Sample size n =65 Sample mean, x̅=$30.15 Sample standard deviation,…

Q: The following data set represents performance scores from a sample of participants in a psychology…

A: The formula to find sample standard deviation is as follows,  s = ∑ x2-∑x2nn-1

Q: find the range and standard deviation, round to two decimals places: The table below gives the…

A:

Q: The following are total cholesterol scores measured in 10 patients who are participating in a study…

A: The provided information is:Sample size (n)=10Consider X is a random variable defined as cholesterol…

Q: Rico used the Internet to survey the per quart of synthetic motor oil for his high-performance…

A: Calculate Sample Standard deviation (S) from the following grouped data X Frequency 372.20 1…

Q: The following data are the distances between 20 retail stores and a large distribution center. The…

A: Given data, 29; 30; 34; 40; 58; 67; 68; 69; 76; 86; 87; 95; 96; 96; 99; 106; 112; 127; 145; 150…

Q: Find the standard deviation for the following data set. ​2, 2,​ 2, 5,​ 5, 6,​ 6, 8,​ 8, 9   A. 2.49…

A:

Q: The following data represents the number of blogs that a sample of students state they follow. 12,…

A: From the provided information, 12, 3, 10, 9, 0, 1, 8, 7, 3, 10, 19 Number of observations (n) = 11

Q: The following data are the distances between 20 retail stores and a large distribution center. The…

A:

Q: The following data represent the number of people aged 25 to 64 years covered by health insurance​…

A: The following table gives the data set with the required calculations:

Q: As the new manager of a small convenience store, you want to understand the shopping patterns of…

A: Let X represents the purchase amount. x 39.05 2.73 32.92 47.51 37.91 34.35 64.48…

Q: Assuming that the heights of college women are normally distributed with mean 62 inches and standard…

A: If Xis a normal variate with mean=μ, S.D=σ, then Z=x-μσ is a standard normal variate. That is, If…

Q: Use the range rule of thumb to approximate the standard deviation. 22, 29, 21, 24, 27, 28, 25, 36 O…

A: The given data is listed below. 22, 29, 21, 24, 27, 28, 25, 36. The objective is to find the…

Q: The tourist bureau of the Caribbean Island survey a sample of 6 United States tourists as they left…

A: The mean number of days spent on the visit can be calculated as:

Q: the same aggregate marks and were bracketed equal. Use the fołlow- ing data to determine whether or…

A:

Q: For the following population, answer the following: Remember you can copy and "paste special" the…

A: Given population size is 12.

Q: me height, in inches, of each student in Megan's algebra class is shown. 72 72 71 70 70 70 69 67 66…

A: As a general rule, the median, mean, and quartiles will be changed by adding a constant to each…

Q: The following data represent the number of people aged 25 to 64 years covered by health insurance​…

A:

Q: Suppose you were given the following data for a section of STAT 210 with 126 enrolled students: 63…

A: Given: Sample size n = 20 Formula Used: Interquartile range = Q3 - Q1 Standard deviation = ∑Xi-X2n-1…

Q: You may need to use the appropriate appendix table or technology to answer this question. According…

A: Given information- Sample size, n = 65 Sample mean, x-bar = $30.15 Sample standard deviation, s =…

Q: Use a calculator to find the standard deviation of this sample data: 122 141 140 118 155 174 198 133…

A: According to the given information, we have Data set: 122,141,140,118,155,174,198,133,168,195

Q: A greenhouse full of tomato plants is being looked after by a farmer. He measures each of the plants…

A: The frequency distribution for heights of tomato plants is given below : For computing the…

Q: A learner has the following scores. an ACT composite score of 32 an SAT mathematics score of 760…

A: The following information has been given: The ACT composite score is X=32. The SAT mathematics score…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.