Question

1. An instructor gives the same y vs. x data as given below to four students and asks them to regress the data with least squares regression to y^ = a?+a?x x 1 10 20 30 40 y 1 100 400 600 1200 They each come up with four different answers for the straight-line regression model. Only one is correct. The correct model is A) y^ = 60x - 1200 B) y^ = 30x - 200 C) y^ = -139.43 + 29.684x D) y^ = 1 + 22.782x Descriptive Stat. What is the mean of this set of numbers: 4, 6, 7, 9, 2000000? a. 7.5 b. 400,005.2 c. 7 d. 4 A national random sample of 20 ACT scores from 2010 is listed below. Calculate the sample mean and standard deviation. 29, 26, 13, 23, 23, 25, 17, 22, 17, 19, 12, 26, 30, 30, 18, 14, 12, 26, 17, 18. a. 20.50, 5.79 b. 20.50, 5.94 c. 20.85, 5.79 d. 20.85, 5.94

          1. An instructor gives the same y vs. x data as given below to four students and asks them to regress the data with least squares regression to y^ = a?+a?x

x 1 10 20 30 40
y 1 100 400 600 1200

They each come up with four different answers for the straight-line regression model. Only one is correct. The correct model is
A) y^ = 60x - 1200
B) y^ = 30x - 200
C) y^ = -139.43 + 29.684x
D) y^ = 1 + 22.782x

Descriptive Stat.

What is the mean of this set of numbers: 4, 6, 7, 9, 2000000?
a. 7.5
b. 400,005.2
c. 7
d. 4

A national random sample of 20 ACT scores from 2010 is listed below. Calculate the sample mean and standard deviation. 29, 26, 13, 23, 23, 25, 17, 22, 17, 19, 12, 26, 30, 30, 18, 14, 12, 26, 17, 18.

a. 20.50, 5.79
b. 20.50, 5.94
c. 20.85, 5.79
d. 20.85, 5.94

1. An instructor gives the same y vs. x data as given below to four students and asks them to regress the data with least squares regression to y^ = a?+a?x

x 1 10 20 30 40
y 1 100 400 600 1200

They each come up with four different answers for the straight-line regression model. Only one is correct. The correct model is
A) y^ = 60x - 1200
B) y^ = 30x - 200
C) y^ = -139.43 + 29.684x
D) y^ = 1 + 22.782x

Descriptive Stat.

What is the mean of this set of numbers: 4, 6, 7, 9, 2000000?
a. 7.5
b. 400,005.2
c. 7
d. 4

A national random sample of 20 ACT scores from 2010 is listed below. Calculate the sample mean and standard deviation. 29, 26, 13, 23, 23, 25, 17, 22, 17, 19, 12, 26, 30, 30, 18, 14, 12, 26, 17, 18.

a. 20.50, 5.79
b. 20.50, 5.94
c. 20.85, 5.79
d. 20.85, 5.94

Added by Hayden G.

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