Suppose that Mary, Gary, and Larry have been asked to randomly sample 100 patients' visit recordsfrom a file of 2000 patient records and record the amount of time the attending physician spent witheach patient. Gary suggests the time of year during which the patient was seen may be a confoundingvariable and strongly advises dividing the year into quarters (Jan - Mar, Apr-Jun, Jul-Sep, Oct-Dec) and randomly selecting 25 patient records from each quarter. Which of the following bestdescribes Gary's sampling plan?(A) A simple random sample(B) A systematic random sample(C) A stratified random sample(D) A cluster sample(E) A convenience sample

In statistics, sampling is a method that allows us to get information about the population based on…

Answered: Suppose that Mary, Gary, and Larry have…

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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Can you conclude that the proportions of people giving the various responses changed between 2015and 2016? Use the 0.01 level of significance.
A survey was conducted in 1990 asking American high school students to name their favorite subject in school. This survey found that, in 1990, the following proportions of students named each subject as their favorite: 30% History, 25% Math, 20% English, 15% Biology, 10% Chemistry. A researcher in the year 2020 conducts an identical survey, in order to see if students’ favorite subjects have shifted over the 30 years that have passed since the 1990 study was done. The researcher gives the survey to n=60 high school students, and gets the following observed frequencies and expected frequencies. FREQUENCY History Math English Biology Chemistry TOTAL fo 20 18 10 5 7 60 fe (.30)(60) = 18 (.25)(60) = 15 (.20)(60) = 12 (.15)(60) = 9 (.10)(60) = 6 60 QUESTION 1: Are the proportions on this problem from an assumption of all equal, or from past research?
Consider two data sets. Set A: n = 5; x = 4 Set B: n = 50; x = 4 (a) Suppose the number 26 is included as an additional data value in Set A. Compute x for the new data set. Hint: x = nx. To compute x for the new data set, add 26 to x of the original data set and divide by 6. (Round your answer to two decimal places.) (b) Suppose the number 26 is included as an additional data value in Set B. Compute x for the new data set. (Round your answer to two decimal places.)
Only the question 5 and 6 need to be resolved. Others have been reaolved already. Question: sample of 15, 10 years old children was taken to study whether watching television reduces the amount of physical exercise, causing weight gains. The number of kilograms each child was overweight by was recorded (a negative number indicates the child is underweight). In addition, the number of hours of television viewing per week was also recorded. These data are listed in the table below. Television(hours) 42 34 25 35 37 38 31 33 19 29 38 28 29 36 18 Overweight (Kg) 8 3 0 0 6 6 3 3 -4 4 4 2 1 6 -3 Use an appropriate plot to investigate the relationship between Television(hours) and Overweight (KG). Briefly explain the selection of each variable on the X and Y axes and why? Calculate and interpret the coefficient of correlation (r) between Television(hours) and Overweight (KG).…
Mariah Jacobsen is the marketing manager at ABC Electronics, a major consumer electronics supplier in the northwest. Over the last five years, sales of the company's flagship product - the Wizer Anonymizer (the WA) - have been 45000, 45500, 44500, 46000 and 44000 units. This rate of sales is considered average for the product over the last twenty years or so. Ms. Jacobsen believes that the distribution of the WA's sales is normal with a standard deviation of 1500 units. If she were asked to make a forecast of next year's sales to upper management, what is the likelihood that she would be correct if she predicts sales between 43000 and 46000?
Set A: n = 5; x = 10Set B: n = 50; x = 10(a) Suppose the number 32 is included as an additional data value in Set A. Compute x for the new data set. To compute x for the new data set, add 32 to x of the original data set and divide by 6. (Round your answer to two decimal places.) b.) Suppose the number 32 is included as an additional data value in Set B. Compute x for the new data set. (Round your answer to two decimal places.)
Suppose we have the following data available for the average number of hours spent in the Santa Fe College Math lab. Male Female 1.50 0.75 1.20 0.82 1.30 0.91 1.05 0.84 0.75 0.59 0.80 1.02 1.00 1.90 0.95 2.10 0.925 2.20 2.50 2.50 3.00 3.50 3.50 2.20 4.01 1.80 Use Data Displays to comment on the shape of the distribution, measures of center and spread, possible skew, and outliers for both genders. (Hint: Use as many displays as needed.)
Suppose a government organization reported the accompanying data on the number of speed-related crash fatalities during holiday periods for the years from 1994 to 2003. Speed-Related Fatalities Holiday Period 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 New Year's Day 143 144 176 76 219 138 171 134 210 70 Memorial Day 195 176 185 197 138 183 156 190 188 181 July 4th 178 219 202 179 169 178 219 64 234 184 Labor Day 189 188 166 179 162 171 180 138 202 189 Thanksgiving 212 198 218 210 203 168 187 217 210 202 Christmas 152 129 66 183 134 191 155 210 60 198 (a) Calculate the standard deviation for the New Year's Day data. (Round the answer to three decimal places.) (b) Without calculating the standard deviation of the Memorial Day data, determine whether the standard deviation for the Memorial Day data would be larger or smaller than the standard deviation of the New Year's Day data. larger smaller (c) Memorial Day and Labor Day are holidays that always occur on Monday and Thanksgiving…

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