# Project #19021 - biostat 5F

FINAL EXAM               MATH 577                 Name __________________

NOTE:  Complete the following take?home exam. You are not to discuss this exam with anyone other than the instructor, nor are you to receive help or assistance from anyone.  Show your work.  There is no time limit and you may use your books and your notes.

1.Form a 95% confidence interval on the difference in the means.  Assume population variances are equal.

sample          A  B

sample size    12     12

sample mean    6550

sample std dev  7 9

2.Perform a Mann?Whitney test to test for equal medians using

a significance level of 0.05.

SAMPLE 1SAMPLE 2

5272

7862

5691

9088

6590

3.Use the following data to determine whether the median is less than 48. Use the Wilcoxon signed rank test(significance level of 0.05).

OBS 47  46  40  40  46  35  34  59  54  33

4.Using a 5% level of significance, test whether the mean number of credits for students taking the CPA exam is greater than 140. Assume that a sample of 100 has a mean of 155 and a standard deviation(s) of 15.

5.      Use the data below to form a 95% confidence interval on the difference in the population means.

Nmeanstd dev(s)

Sample 1  1005270150

Sample 21005220100

6.Using a significance level of 0.05, test the claim that the proportion of toothpaste brands with ADA seal is less than 0.50.  Assume in a sample of 100, 45 have the ADA seal.

7.Forma a 95% confidence interval on the mean pouring temperature for iron castings if a sample of size 10 yielded a mean of 2560 and a standard deviation (s) of 20.

8.Given the results below, form a 95% confidence interval on the difference in the proportions.

group       sample size        number of successes

A                 500                  300

B                 500                  250

9.  Using the following ANOVA and a significance level of 0.05, test whether the slope of the regression line is positive.

The regression equation is

Y = 3.64 + 1.89 x

predictorcoefstdevt-ratio

constant3.6433.7650.97

X1.89320.28516.64

ANOVA

source        df        ss           ms F

regression     11285.71285.744.09

error         13 379.129.16

total          141664.8

10.Using the output in problem 9, form a 95% confidence interval on the slope.

11.   Calculate the slope and intercept.

 x y xy x2 y2 42 9 378 1764 81 48 10 480 2304 100 50 8 400 2500 64 59 5 295 3481 25 72 3 216 5184 9 271 35 1769 15233 279

12.In a sample of size 18, the sample correlation coefficient was found to be 0.6.  Test the hypothesis that the population correlation coefficient is greater than zero using a significance level of 0.05.

13.Given the following contingency table (using a significance level of 0.05), and assuming the value of the test statistic is 4.74, test for independence between illness & vaccination.

MS      SSH

male 374144

female 357271

14.In a one?way ANOVA the following table is obtained:

source           df         SS          MS     F

factor  2 1200  600   6.00

within(error)   24 2400  100

total          26 3600

Test for equal factor means using a significance level of .05.

15.Using the following table:

source           df         SS          MS     F

regression  5 2000  400   4.00

within(error)   15  1500  100

total          20 4400

Test for model using a significance level of .05.

 Subject Mathematics Due By (Pacific Time) 12/10/2013 12:00 pm
TutorRating
pallavi

Chat Now!

out of 1971 reviews
amosmm

Chat Now!

out of 766 reviews
PhyzKyd

Chat Now!

out of 1164 reviews
rajdeep77

Chat Now!

out of 721 reviews
sctys

Chat Now!

out of 1600 reviews

Chat Now!

out of 770 reviews
topnotcher

Chat Now!

out of 766 reviews
XXXIAO

Chat Now!

out of 680 reviews