A teller at a drive-up window at a bank had the following service times(in minutes) for 20 randomly selected customers:SAMPLE12344.54.64.54.74.24.54.64.64.24.44.44.84.34.74.44.54.34.34.64.9If the process parameters are unknown, estimate its mean andstandard deviation. (That is, find the average and standard deviation ofall data points at once.)Select one:O a.O b.c.O d.e.f. x_bar = 4.7, s = 0.0368g. x_bar = 4.3, s = 0.19x_bar = 4.7, s = 0.19x_bar = 4.3, s= 0.0368x_bar = 4.5, s = 0.0368x_bar = 4.5, s = 0.19None of the other options.

The question is about measures.Given :To find :Estimate mean and standard deviation of all the data…

Answered: A teller at a drive-up window at a bank…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The times to pop a 3.4-ounce bag of microwave popcorn without burning it are Normally distributed with a mean time of 140 seconds and a standard deviation of 20 seconds. A random sample of four bags is selected and the mean time to pop the bags is recorded. Which of the following describes the sampling distribution of all possible samples of size four? approximately Normal with a mean of 70 seconds and a standard deviation of 5 seconds approximately Normal with a mean of 70 seconds and a standard deviation of 20 seconds approximately Normal with a mean of 140 seconds and a standard deviation of 20 seconds approximately Normal with a mean of 140 seconds and a standard deviation of 10 seconds
i need C and D
2. 60 matches were played in a football tournament. The table to the right shows the number of goals scored in all matches. Number of Goals 1 3 4 5 Number of Matches 18 20 3 a. Find the median number of goals scored per match. b. Find the mean number of goals scored per match. c. Calculate the standard deviation of the goals scored per match.
Here are 11 values from a dataset: 0 0 0 1 2 2 3 4 6 6 6 The sample mean for this dataset is 2.73. Which of the following values is your best guess for the approximate size of the sample standard deviation for these 11 numbers: 1, 2.5, or 5? You may calculate the sample standard deviation for this set of data but it is not required. lp
A company manufactures an electrical cooling fan. When the fans are performing properly, samples of 200 fans average 12.5 watts with an average range of 1.2 watts. A 3σ control chart program is being used to monitor the performance of the fans, and these data from the 10 most recent samples were collected: Sample Number Sample Mean Sample Range 1 12.5 1.1 2 12.45 1.2 3 12.55 0.9 4 12.50 0.8 5 12.45 0.9 6 12.60 1.0 7 12.48 1.4 8 12.46 1.1 9 12.56 0.9 10 12.48 0.8 Compute the 3σ control limits and center line for an ⁻x chart. Compute the 3σ control limits and center line for an R chart. Plot the sample data on the ⁻x and R charts and decide if the performance of the fan is in control.
The following are the normalized levels of a critical protein in 12 samples of blood: 8.2 , 4.7 , 10.3 , 11.7 , 18.3 , 5.9 , 3.8 , 18.9 , 7.6 , 14.2 , 9.8 , 16.4 Compute the sample mean, the sample median, and the sample standard deviation.
A researcher studied 5050 adults daily screen time. She had them record the amount of hours (rounded to the nearest hour) they spent looking, listening or reading at computer or cell phone daily. The frequency table below shows the results. Hours of Screen Time Frequency 7 5 8 6 9 4 10 5 11 8 12 10 13 9 14 3 The researcher found that the mean number of hours of the data set was 10.7210.72. She wants to also find range and standard deviation. Find the range of the data set.range = Find the standard deviation of the data setstandard deviation = Round your result to two decimal places.
Longevities of Archbishops and Monarchs 16 Archbishops 16 15 15 16 17 1 18 18 10 13 13 11 13 11 11 17 18 10 18 12 19 17 Monarchs 14 18 14 13 19 16 21 14 16 17 15 16
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 136 and a standard deviation of about 45. Assume forty-two individuals are randomly chosen. Answer the following questions. Round all answers to 4 decimal places where possible. Find the third quartile for the average number of Facebook friends
The average amount of money that people spend at Don Mcalds fast food place is $7.2700 with a standard deviation of $1.7900. 42 customers are randomly selected. Please answer the following questions, and round all answers to 4 decimal places where possible and assume a normal distribution. 1.The owner of Don Mcalds gives a coupon for a free sundae to the 4% of all groups of 42 people who spend the most money. At least how much must a group of 42 spend in total to get the free sundae? $
The following data related the rubber percentage of two types of rubber plants, where the sample have been drawn independently. Test for their mean difference. Type 1 6.21 5.70 6.04 4.47 5.22 4.45 4.84 5.84 5.88 5.82 6.09 5.59 6.06 5.59 6.74 5.55 Type II 4.28 7.71 6.48 7.71 7.37 7.20 7.06 6.40 8.93 5.91 5.51 6.36
The table below shows two samples taken to compare the mean age of individuals who purchased the iPhone at two AT&T store locations. Ann Arbor 25.817 Livonia 31.248 1.874 10 3.389 7 At a=05, can you conclude that the first sample has a larger variance than the second sample? Statistic Mean Standard Deviation. Sample size Multiple Choice No, the p-value>.05. Unclear because the p-value is approximately equal to 05. Yes, the p-value <.05. No because the p-value is approximately equal to 05

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