Do wearable devices that monitor diet and physical activity help people lose weight? Researchers had 237 subjects, already involved in a program of diet and exercise, use wearable technology for 24 months. They measured their weight (in kilograms) before using the technology and 24 months after using the technology. (a) Explain why the proper procedure to compare the mean weight before using the wearable technology and 24 months after using the wearable technology is a matched pairs t test. Choose the correct explanation. A person's weight before and after wearing the device would not be independent; thus, the data from this before and after study should be analyzed using a matched pairs t test. O A person's weight before and after wearing the device would be independent; thus, the data from this before and after study should be analyzed using a matched pairs t test. O A person's weight before and after wearing the device would be independent; thus, the data from this before and after study should not be analyzed using a matched pairs t test. O A person's weight before and after wearing the device would not be independent; thus, the data from this before and after study should not be analyzed using a matched pairs t test. (b) The 237 differences in weight (weight after 24 months minus weight before using the wearable technology) are I = -3.5 and s = 7.8. Let u be the mean weight difference (weight after 24 months minus weight before using the wearable technology). Complete the test to see if there is significant evidence of a reduction in weight after using the wearable technology. What is the correct null and alternative hypothesis? Select an answer choice. Publisher: W.H. Freer Question Source: Moore, The Basic Practice Of Statistics, 8e What is the correct null and alternative hypothesis? Select an answer choice. Ho : u <0 versus Ha : u = 0 OHo : u =0 versus Ha µ< 0 O Ho : µ = 0 versus H. : µ 70 O Ho : u > 0 versus H. :H < 0 What is the test statistic t ? (Enter your answer rounded to three decimal places.) t = What is the P-value? Select an answer choice. OP> 0.05 OP=0.0001 P> 0.01 OP<0.0001 Publisher: W.H. F Question Source: Moore, The Basic Practice Of Statistics, 8e
Do wearable devices that monitor diet and physical activity help people lose weight? Researchers had 237 subjects, already involved in a program of diet and exercise, use wearable technology for 24 months. They measured their weight (in kilograms) before using the technology and 24 months after using the technology. (a) Explain why the proper procedure to compare the mean weight before using the wearable technology and 24 months after using the wearable technology is a matched pairs t test. Choose the correct explanation. A person's weight before and after wearing the device would not be independent; thus, the data from this before and after study should be analyzed using a matched pairs t test. O A person's weight before and after wearing the device would be independent; thus, the data from this before and after study should be analyzed using a matched pairs t test. O A person's weight before and after wearing the device would be independent; thus, the data from this before and after study should not be analyzed using a matched pairs t test. O A person's weight before and after wearing the device would not be independent; thus, the data from this before and after study should not be analyzed using a matched pairs t test. (b) The 237 differences in weight (weight after 24 months minus weight before using the wearable technology) are I = -3.5 and s = 7.8. Let u be the mean weight difference (weight after 24 months minus weight before using the wearable technology). Complete the test to see if there is significant evidence of a reduction in weight after using the wearable technology. What is the correct null and alternative hypothesis? Select an answer choice. Publisher: W.H. Freer Question Source: Moore, The Basic Practice Of Statistics, 8e What is the correct null and alternative hypothesis? Select an answer choice. Ho : u <0 versus Ha : u = 0 OHo : u =0 versus Ha µ< 0 O Ho : µ = 0 versus H. : µ 70 O Ho : u > 0 versus H. :H < 0 What is the test statistic t ? (Enter your answer rounded to three decimal places.) t = What is the P-value? Select an answer choice. OP> 0.05 OP=0.0001 P> 0.01 OP<0.0001 Publisher: W.H. F Question Source: Moore, The Basic Practice Of Statistics, 8e
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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Transcribed Image Text:Do wearable devices that monitor diet and physical activity help people lose weight? Researchers had 237 subjects, already
involved in a program of diet and exercise, use wearable technology for 24 months. They measured their weight (in
kilograms) before using the technology and 24 months after using the technology.
(a) Explain why the proper procedure to compare the mean weight before using the wearable technology and 24 months
after using the wearable technology is a matched pairs t test. Choose the correct explanation.
A person's weight before and after wearing the device would not be independent; thus, the data from this before and
after study should be analyzed using a matched pairs t test.
O A person's weight before and after wearing the device would be independent; thus, the data from this before and after
study should be analyzed using a matched pairs t test.
O A person's weight before and after wearing the device would be independent; thus, the data from this before and after
study should not be analyzed using a matched pairs t test.
O A person's weight before and after wearing the device would not be independent; thus, the data from this before and
after study should not be analyzed using a matched pairs t test.
(b) The 237 differences in weight (weight after 24 months minus weight before using the wearable technology) are
I = -3.5 and s = 7.8. Let u be the mean weight difference (weight after 24 months minus weight before using the
wearable technology). Complete the test to see if there is significant evidence of a reduction in weight after using the
wearable technology.
What is the correct null and alternative hypothesis? Select an answer choice.
Publisher: W.H. Freer
Question Source: Moore, The Basic Practice Of Statistics, 8e
Transcribed Image Text:What is the correct null and alternative hypothesis? Select an answer choice.
Ho : u <0 versus Ha : u = 0
OHo : u =0 versus Ha µ< 0
O Ho : µ = 0 versus H. : µ 70
O Ho : u > 0 versus H. :H < 0
What is the test statistic t ? (Enter your answer rounded to three decimal places.)
t =
What is the P-value? Select an answer choice.
OP> 0.05
OP=0.0001
P> 0.01
OP<0.0001
Publisher: W.H. F
Question Source: Moore, The Basic Practice Of Statistics, 8e
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