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COMM 291 (92)
Lecture

Assignment 5.docx

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Department
Commerce
Course
COMM 291
Professor
Jonathan Berkowitz
Semester
Winter

Description
Sonia Bains Question 1 a) The populations being examined are 1) houses without fireplaces and currently for sale and 2) houses with one or more fireplaces and currently for sale. b) List Price: Since ( ) ( ), we can pool and into ( ) ( ) √ ( ) √ d.f. and P-value ( ) The evidence is extremely strong that the listing prices of houses without fireplaces and houses with are different. Houses with fireplaces are more expensive. Living Area: Two–Tailed P–value There is very strong evidence that the living area of houses without fireplaces and houses with fireplaces are different. Houses with fireplaces are larger. Age: Two–Tailed P–value There is very strong evidence that the age of houses without fireplaces and houses with fireplaces are different. Houses with fireplaces are newer c) 95% CI for Used ( ) √ ( ) Sonia Bains d) The null value of 0 is not within the 95% CI for . Therefore we reject the null hypothesis in a 2-sided hypothesis test at , which is consistent with our results in part b). Question 2 a) √ P-value ( ) between and We reject the null hypothesis at and conclude that average spending in December is greater than average spending in January through March. b) January to February √ P-value = ( ) January to March √ P-value = ( ) February to March √ P-value = ( ) There is no evidence of a difference in mean spending between each of the pairs of months. c) 95% CI December to JanMarAvg √ January to February √ January to March √ Sonia Bains February to March √ The intervals confirm the two-sided tests in part b), not the one-sided test in part a). Question 3 a) Part Time Work ̂ ̂ SE ̂ ̂ ) ( ) ( ) ( ) √ P-value ( ) there is insufficient evidence that the proportions of males and females who do part-time work are different at . Twitter User
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