# Business Statistics

posted by .

Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.

• Business Statistics -

Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
a. Calculate the mean of the 20 samples
b. Draw a histogram showing the 20 sample means. (Use classes -0.5 to 0.5, 0.5 to 1.5, 1.5 to 2.5 and so on).
c. Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
d. Draw 20 more samples and add the 20 new x-bars to the histogram in part b. Describe the distribution that seems to be developing
Use the empirical rule to test for normality. See the sampling distribution of sample means and the central limit theorem develop from your own data!
Question 2
Consider a population with ì = 43 and ó = 5.2.
a. Calculate the z-score for anx̅ of 46.5 from a sample of size 35.
b. Could this z-score be used in calculating probabilities using Table 3 in Appendix B? Why or why not?
Question 3
State the null and alternative hypotheses for each of the following:
a. You want to show an increase in buying and selling of single-family homes this year when compared with last year’s rate.
b. You are testing a new recipe for “low-fat” cheesecake and expect to find that its taste is not as good as traditional cheesecake.
c. You are trying to show that music lessons have a positive effect on a child’s self-esteem.
d. You are investigating the relationship between a person’s gender and the automobile he or she drives—specifically you want to show that more males than females drive truck-type vehicles

• Business Statistics -

Describe the district ution of the x-bars that you see in part b (shape of distribution, center, and the amount of depersion).

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### math

The last part of a telephone number has four digits, e.g. 7814 1487 2103 2772 The last part of the telephone number can start with any digit apart from zero. The other three digits can be any number. How many four digit numbers are …
2. ### MATH

The last part of a telephone number has four digits, e.g. 7814 1487 2103 2772 The last part of the telephone number can start with any digit apart from zero. The other three digits can be any number. How many four digit numbers are …
3. ### Maths

The Sentosa High School's telephone number is an eight digit number. The sum of the two numbers formed from the first three digits and the last five digits respectively 66558. The sum of two numbers formed from the first five digits …
4. ### Math. Explain

From the digits 1, 2, 3, and 4, how many positive integers are less than 100,000?
5. ### Statistics

if it can be assumed that 39.5% of all telephone #'s are unlisted, and that all telephone #'s are independent,find the probability that at least 1 of 5 telephone numbers are listed.
6. ### Data Mangement- Math

Paula moves to an area with a different telephone exchange. Telephone numbers in the new exchange start with 753, and all combinations of the four remaining digits are equally likely. a) Calculate the probability that the last four …
7. ### Business Statistics

Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits. Calculate the mean of …
8. ### Algebra 2

Telephone numbers are made of 7 digits. Digits can be repeated but the first digit cannot be 0 or 1. How many different telephone numbers can be created?
9. ### math

One of the standard telephone numbers for directory assistance is 555−1212. How many different permutations of this telephone number are possible?
10. ### probability

In the state of Georgia, telephone numbers consists of 10 digits, including the area code. One of these area codes is 770. The first digit following the area code cannot be 1 or 0. Find the number of possibilities for telephone numbers …

More Similar Questions