Math 201 Practice Final
Please work out each of the given problems. Credit will be based on the steps that you show
towards the final answer. Show your work.
Printable Key
Problem 1
Match the following hypotheses and estimates with the appropriate test statistic or confidence
interval. Explain your reasoning.
i) A confidence interval for a population mean.
ii) A confidence interval for a population proportion.
iii) A confidence interval for the difference between two independent population means
iv) A confidence interval for the difference between two population proportions.
v) A confidence interval for paired differences (dependent samples).
vi) A confidence interval for the value of
y
given a value of
x
using a regression line.
vii) A hypothesis test for a population mean.
viii) A hypothesis test for a population proportion.
ix) A hypothesis test for the difference between two independent population means
x) A hypothesis test for the difference between two population proportions.
xi) A hypothesis test for paired differences (dependent samples).
xii) Chi squared test for independence.
xiii) Chi squared test for goodness of fit.
A. Are automobile prices higher in South Lake Tahoe then in Sacramento. Fifty Subaru
Legacy's from the South Tahoe dealership and fifty from the Sacramento dealership were sold
last month and recorded
Solution
B. Does the color of the paper used for a final exam influence performance? 200 students were
randomly given the same test on blue, red, and white paper. The number of A's, B's, C's, D's
and F's for each color were tabulated.
Solution
C. Is honey a better medicine for small wounds than conventional salves? Currently
9%
of the
wounds that are treated with conventional salves end up infected.
150
wounds in a study group
were treated with honey.
Solution
D. How much of the food that you buy ends up being thrown out? A refrigerator was monitored
that had
45
perishable items.
Solution
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
E. How long can you expect to live if your cholesterol level is
230
? Data has been taken from
45,000
people with varying levels of cholesterol.
Solution
F. How much better has the NASDAQ done than the Dow Jones Industrial Average this year?
The daily point gains and losses have been charted since January 2.
Solution
G. What are the low and high estimates for the number of Kokanee salmon that will run in Trout
Creek this fall? Data has been collected over the last forty years.
Solution
Problem 2
Your business is being investigated about unfair promotion practices with regard to
race. Your policy is to promote
20%
of your employees. Your current staff consists of
200
Caucasians,
50
Hispanics,
30
African Americans, and
20
classified as other. Below is a table
that shows the number of employees that were promoted last year.
Caucasian
Hispanic
African American
Other
50
6
3
1
what can be concluded at the
5%
level?
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '10
 Driscoll
 Math, Statistics, Normal Distribution, Statistical hypothesis testing

Click to edit the document details