Draw a histogram showing the 20 sample means

Assignment Help Basic Statistics

Reference no: EM13155471

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 the 20 samples
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).
Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
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 μ = 43 and σ = 5.2.

Calculate the z-score for an x¯ of 46.5 from a sample of size 35.
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:

You want to show an increase in buying and selling of single-family homes this year when compared with last year's rate.
You are testing a new recipe for "low-fat" cheesecake and expect to find that its taste is not as good as traditional cheesecake.
You are trying to show that music lessons have a positive effect on a child's self-esteem.
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.

Reference no: EM13155471

Questions Cloud

Explain how many snails would it take to make a firkin : What is its speed in cm/sec? (b) How far in meters would it travel in 2.00 days? (c) If a snail weighs 2.00 grams, how many snails would it take to make a firkin at sea level?

Depreciation difference and warranty expense : Neer's income statement also included $225,000 accrued warranty expense that will be deducted for tax purposes when paid. Neer's enacted tax rates are 30% for 2007 and 2008, and 24% for 2009 and 2010. The depreciation difference and warranty expen..

Average cost of making a movie : During a recent year the average cost of making a movie was $54.8 million. This year, a random sample of 15 recent action movies had an average production cost of $62.3 million with a variance of $ 8 million.

What is the most probable mode of inheritance : P.T.C. Taster: to some people, the chemical, phenylthiocarbamide, has a strong bitter taste. However there are other individuals who are unable to perceive such a taste sensation.

Draw a histogram showing the 20 sample means : 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). Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).

Would intercept seem to have meaning in regression : Observations are taken on sales of a certain mountain bike in 30 sporting goods stores. The regression model was Y = total sales (thousands of dollars). Would the intercept seem to have meaning in this regression?

Explain the reason for heightened racism : Explain the reason for heightened racism and declining abolitionist sentiment in the 1790s and early 1800s. I would like to talk about the amount of slaves and how racism suppressed them, the measures by the government to incite racism, and declining..

Can the average(mean) salary in the population : Complete the problems below and submit your work in an Excel document. Be sure to show all of your work and clearly label all calculations. All statistical calculations will use the Employee Salary Data Set.

Draw a cvp chart for the company : The company's annual fixed costs are $1,125,000. (1) Use this info to compute the company's (a) contribution margin, (b)contribution margin ratio, (c)break-even point in units, and (d) break even point in dollars of sales. (2) Draw a CVP chart for..

User Account

All Pages