Question: Television viewing reached a new high when the Nielsen Company reported a mean daily viewing time of 8.35 hours per household (USA Today). Use a normal probability distribution with a standard deviation of 2.5 hours to answer the following questions about daily television viewing per household.
1: What is the probability that a household views television less than 7 hours?
2: What is the probability that a household views television between 7 and 8 hours a day?
3: How many hours of television viewing must a household have in order to be in the top 5% of all television viewing households?
Lori Jeffery is a successful sales representative for a major publisher of college textbooks. Historically, Lori obtains a book adoption on 25% of her sales calls. Viewing her sales calls for one month as sample of all possible sales calls, assume that a statistical analysis of the data yields a standard error of the proportion of 0.0625.
4: What is the probability that Lori will obtain bock adoptions on 35% or more of her sales calls during a one-month period?
An application of Excel "Data Analysis - Descriptive Statistics"
A simple random sample of ten employees of a large corporation provided the following information.
|
Employee
|
Age
|
|
1
|
30
|
|
2
|
33
|
|
3
|
24
|
|
4
|
41
|
|
5
|
50
|
|
6
|
53
|
|
7
|
21
|
|
S
|
26
|
|
9
|
38
|
|
10
|
48
|
5: Determine the point estimate for the average age of all employees using Excel "Data Analysis: Descriptive Statistics" function.
6: What is the point estimate for the standard deviation of the average age of all employees?
7: Describe the point estimate, normal probability distribution. Find standard normal probability distribution in detail (One double space typed page).