Do various occupational groups differ in their diets? A British study of this question compared 98drivers and 83 conductors of London double-decker buses. The conductors' jobs require morephysical activity. The article reporting the study gives the data as "Mean daily consumption (+se)." Some of the study results appear below.DriversTotal calories2821 +44Alcohol (grams) 0.24 0.06Conductors2844 +480.39 ± 0.11Construct a 99% confidence interval for the difference in mean daily alcohol consumptionbetween drivers and conductors.

Given Information: Drivers Conductors Total calories 2821±44 2844±48 Alcohol (grams)…

Answered: Do various occupational groups differ…

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 stated goal of a chain of service stores is to provide a lube and oil change for anyone's automobile in 15 minutes. The manager at one store thinks that there is a growing disparity among his workers in the time it takes to lube and change the oil of an automobile. To monitor this, the manager has selected a sample of 20 days and has recorded the time it took five randomly selected employees to service an automobile. The data are found below. Complete parts a through d Click the icon to view the data. a. The manager noticed that the longest time it took to service a car was 25.73 minutes. Suppose the distribution of fimes to service a car was normal, with a mean of 15. Without analyzing the sample data, use your knowledge of a normal distribution to give the manager an estimate for the population standard deviation for the time it takes to service a car. The standard deviation is minutes. (Round to two decimal places as needed.) b. Use the data to construct an x- and an R-chart.…
I need help with only question 14. I need help with parts a,b,c,d, and e.
Question 9 You are reviewing the nutrition values of different snack bars for health class. A summary of calculations for the 10 snack bars is shown below. Mean: 133 Median:140 Range: 125 IQR: 60 A new kind of snack bar was just advertised. You decide to in- clude the information for the new snack bar to your data set. Below is the new summary for the nutrition data of all 11 snack bars:
Study A Use the following description of a research study to answer the next five questions. Researchers were were interested in promoting physical activity within the workplace. They recruited participants to join a team challenge encouraging ways to increase physical activity such as taking active breaks and taking the stairs. Participants either joined as a team or were assigned a team. These teams were then randomly assigned either to be the control group where they just received information about becoming more active or the team-building group, which received the same information as the control group but were encouraged to create a team name and bond as a team throughout the study. One outcome measure of the study was the number of flights of stairs that participants reported taking yesterday. Group Statistics Intervention Mean Std. Deviation Std. Error Mean Flights of stairs yesterday Cbntrol 18 2.3889 3.29240 77603 Team-building 16 6.0000 5.50151 1.37538 Lena Tes Equalty at…
What was the power for this study?
1. Using the following data: 5568 8 9 10 10 12 15 16 19 20 20 21 24 25 25 30 32 Quartile 1 = Quartile 2 = Quartile 3 =
Do you think the results of the study might be applicable to the whole population? Why or why not?
Researchers Holdgate et al. (2016) studied walking behavior of elephants in North American zoos to see if there is a difference in average distance traveled by African and Asian elephants. They put GPS loggers on 33 African elephants and 23 Asian elephants and measured the distance (in kilometers) the elephants walked per day. The data in the file below Elephants contains results that are consistent with what the researchers found: Species Distance: African 6.12 African 3.65 African 4.26 African 3.8 African 5.23 African 5.02 African 5.17 African 5.37 African 4.89 African 6.4 African 6.42 African 6.85 African 3.38 African 7.71 African 4.02 African 3.52 African 5.81 African 5.83 African 7.02 African 6.11 African 4.62 African 5.54 African 3.2 African 5.49 African 5.47 African 6.97 African 3.74 African 3.04 African 7.84 African 8.62 African 7.63 African 5.25 African 4.19 Asian 1.39 Asian 2.59 Asian 8.03 Asian 7.93 Asian 0.33 Asian 8.22 Asian 6.95 Asian 2.39 Asian 3.89 Asian 10.53 Asian…
8.6 Cherry Trees: Timber yield is approximately equal to the volume of a tree, however, this value is difficult to measure without first cutting the tree down. Instead, other variables, such as height and diameter, may be used to predict a tree's volume and yield. Researchers wanting to understand the relationship between these variables for black cherry trees collected data from 31 such trees in the Allegheny National Forest, Pennsylvania. Height is measured in feet, diameter in inches (at 54 inches above ground), and volume in cubic feet. (Hand, 1994) Estimate Std. Error t value P(>|t|) (Intercept) -57.99 8.64 -6.71 0.00 height 0.34 0.13 2.61 0.01 diameter 4.71 0.26 17.82 0.00
I need help making a relative frequency histogram from this data.
State the estimated coefficient for time and its interpretation. Also, state what the coefficient of determination is and its interpretation.
PART 3 A car mat manufacture been having quality issues with its production. A series of tests were carried out to measure the resulting pH of the most common carpet produced, Type 1, as a good indicator of quality. For the following questions show all calculations and formula used. What is the mean, mode and range of the pH after dyeing? Table – Type 1 pH after addition of dye 5.105 to 5.3 5.305 to 5.5 5.5.05 to 5.7 5.705 to 5.9 5.905 to 6.1 6.105 to 6.3 6.305 to 6.5 No. of samples 1 5 7 8 7 4 1 For pH after addition of dye calculate the standard deviation, showing your calculations in full. Plot the standard deviation graph in Excel showing the distribution. From your calculations and the data Give the minimum and maximum limits the pH may be, given that the distribution is normal. Calculate the probability that a randomly selected carpet sample will have a PH of (i) 6.1 and (ii) 5.4. Further tests were carried on a…

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