In the book Essentials of Marketing Research, William R. Dillon, Thomas J. Madden, and Neil
H. Firtle present the results of a concept study for a new wine cooler. Three hundred consumers
between 21 and 49 years old were randomly selected. After sampling
1. Suppose that x has a binomial distribution with n = 200 and p = .4.
a. Show that the normal approximation to the binomial can appropriately be used to
calculate probabilities about x.
b. Make continuity corrections for each of the following, and then u
1. Suppose that the random variable x has an exponential distribution with = 2.
a. Write the formula for the exponential probability curve of x. What are the possible
values of x?
b. Find P(x 1).
c. Find P(.25 x 1).
d. Find P(x 2).
f. Calculate the mean,
THE NATURAL GAS CONSUMPTION CASE
Consider the situation in which a gas company wishes to predict weekly natural gas consumption
for its city. In the exercises of Chapter 13, we used the single predictor variable x, average hourly
temperature, to predict y
Suppose that the random variable x has a uniform distribution with c = 2 and d = 8.
a.Write the formula for the probability curve of x, and write an interval that gives the
possible values of x.
b.Find P(3 x 5).
c.Find P(1.5 x 6.5).
d.Calculate the mean x
BUS 223 Exam 6 Chapters 13-14
1. A cost accountant is developing a regression model to predict the total cost of producing a
batch of printed circuit boards as a linear function of batch size (the number of boards produced
in one lot or batch), production
1. Pate's Pharmacy, Inc. operates a regional chain of 120 pharmacies. Each pharmacy's floor
plan includes a greeting card department which is relatively isolated. Sandra Royo, Marketing
Manager, feels that the level of lighting in the greeting card depart
8-2 Inferences About Two Means: Dependent Samples
Use the formal procedures to test claims about two means from dependent samples and
construct confidence intervals to estimate the mean difference.
If one sample is related to the other, the sam
9-2 Linear Correlation
Determine whether a linear relationship exists between two variables.
A correlation exists between two variables when one of them is related to the
other in some way.
1. Correlation does not prove cause-effect.
2. No line
Identify the regression line and use it to predict values.
Regression Line Equation (line of best fit or least squares line):
Explanatory variable x and response variable y
If there is a significant linear correlation, the best p
8-3 Inferences About Two Means: Independent and Large Samples
Use the formal procedures to test claims about two means from large
independent samples and construct confidence intervals to estimate the
difference between two independent means.
Forn30 and isunknown,
Find the p-value for each scenario. Use =0.05 to determine if
we reject or fail to reject H0.
reject or fail to reject H0
reject or fail to r
Components of Hypothesis Testing
EX 1 After analyzing 106 body temperatures of healthy adults, a medical researcher
makes a claim that the mean body temperature is less than 98.6F.
Section 73: Testing a Claim about a Mean: Large Samples
= 2 x (0.0001)
since p-value (0.0002) <(0.05)
There is sufficient evidence t