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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 samplesDraw 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 2Consider 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 3State 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.
Project was estimated by using ADM/PERT analysis. Due to extensive length of project many activities were combined; Following is the result.
Determine the minimum sample size required in order for you to be confident that your evaluate is within of? Use value for population standard deviation of scores on this subsection.
Use the Internet to find a website that shows an example or application correlation or regression in the area of your interest or in your profession. Discuss how correlation or regression was used and summarize your finding.
Let sales be the independent variable and earnings be the dependent variable. Draw a scatter plot. Compute the coefficient of correlation Compute the coefficient of determination.
For a candidate to win in a congressional district, he has to have won over half of the vote. The Republican candidate takes a poll to assess his chances in a two-candidate race.
Find at least what percentage of all homeowners in this city pay a monthly mortgage of 865 to 1,675.00.
Does a regression model imply causation? Why or why not? Provide an example which provides and independent and dependent variable from your place of work.
Cores on two tests have a bivariate normal distribution; and that correlation of 2 scores is 0.8. Determine the probability that sum of the student's scores on 2 tests will be greater than 200?
Can we conclude at a 98% level of confidence, that the mean number of hours per day using the computer by students at IUP is the same as the typical student's usage?
Find the empirical probability that an iris bulb of this type will bloom. Give answer as a fraction in lowest terms. How many of the bulbs should she plant next fall if she would like at least 52 to bloom?
What is the probability that the student is married, given the student was female? Your answer should be a decimal fraction accurate to 3 decimal places.
Suppose there are two elementary schools in a county. One school (A) loans all its students a laptop computer for use in classes. The other (B) does not
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