Mathematics, 25.12.2019 05:31 0436500
The following 7 questions are related. a statistics practitioner in a large university is investigating the factors that affect salary of professors. he wondered if evaluations by students are related to salaries. to this end, he collected 100 observations on:
y = annual salary (in dollars)
x = mean score on teaching evaluation
to accomplish his goal, he assumes the following relationship:
y = β(0) + β(1)x + ε
then, using excel’s data analysis, he obtained the following result.
r2=0.23
coefficient
standard error
intercept
25675.5
11393
x
5321
2119
what is the p-value?
select one:
a. 0.02
b. 0.01
c. 0.17
d. 0.34
question 26
not yet answered
points out of 1.00
flag question
question text
at α=0.05,
select one:
a. we reject the null hypothesis in favor of the alternative
b. we do not reject the null hypothesis
question 27
the estimated regression model is given by y hat= b0+b1x = 25675.5 + 5321* x. what is the interpretation of b1?
select one:
a. when mean score on teaching evaluation increases by 1, average annual salary increases by 25675.5 dollars.
b. when mean score on teaching evaluation increases by 1, average annual salary increases by 5321 dollars.
c. when annual salary increases by a dollar, mean score on teaching evaluation increases by 5321.
d. when annual salary increases by a dollar, mean score on teaching evaluation increases by 25675.5.
question 28
what is the interpretation of? r2=0.23?
select one:
a. 23% of total variability in annual salaries (about the average) is due to changes in the mean score on teaching evaluation.
b. 23% of total variability in mean score on teaching evaluation (about the average) is due to changes in annual salary.
question 29
question text
suppose that the university uses only mean score of teaching evaluation to determine salary of professors. dr. stevens has worked as a part-time lecturer for several years and recently was offered a professor position. as a part-timer, his mean score teaching evaluation was 5.5. what is the predicted salary of dr stevens using the regression model developed above?
select one:
a. $5321
b. $54941
c. $29265.5
d. $25675.5
Answers: 2
Mathematics, 21.06.2019 14:30
Let f (x) = x e8x. find a formula for the nth derivative of f, where n is any positive integer. use x and n in your answer if needed. f (n)(x) =
Answers: 2
Mathematics, 21.06.2019 18:30
For this option, you will work individually. the pythagorean theorem can be used in many real-world scenarios. part 1 write your own real-world scenario where the pythagorean theorem can be applied to find a missing piece. you may choose to write a problem that is two- or three-dimensional in nature. be sure that you will be able to draw a diagram of your scenario. write out your problem and submit it for part 1. be sure to end your scenario with a question. part 2 draw a diagram of the scenario you created in part 1. you may draw by hand and scan and upload your drawing or create a computer-generated drawing for submission. be sure to label all parts and dimensions of the drawing. part 3 solve the question that you posed in part 1. show all of your steps in answering the question. for this option, you will need to submit all three parts for full credit—your real-world problem and question, the diagram that you created, and your work solving the problem, showing all steps. * note that your instructor is looking for your own original idea. while it is acceptable to use the internet for research and inspiration, academic integrity policies apply.
Answers: 1
Mathematics, 21.06.2019 19:30
Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?
Answers: 1
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