# I need this statistic answer. allen

Don't use plagiarized sources. Get Your Custom Essay on
I need this statistic answer. allen
Just from \$13/Page

1. Find the point estimate of the population mean and the margin of error for a 90% confidence interval for the following drive times (in minutes) for commuters to a college.

35        40        47        22        17        19        36        44        65

55        22        23        16        46        44        38        29        22

37        16        8          15        27        41        45        17        11

45        63        17        28        19        64        55        53        50

Answer:     X  =   S = 1231  = 34.1 Sample Mean

n     36

1. Use the results from the above data (#1) and determine the minimum survey size that is necessary to be 95% confident that the sample mean drive time is within 10 minutes of the actual mean commuting time.

1. In a random sample of 35 tractors, the annual cost of maintenance was \$4,425 and the standard deviation was \$775. Construct a 90% confidence interval for this. Assume the annual maintenance costs are normally distributed.

Answer:   90% = mean ± 1.645 SEm

SEm = SD/√n

I used the table in the back of my statistics text labeled “areas under normal distribution” to find the proportion/probability (±5%) to get Z = 1.645. I assume that you have a similar table available.

1. The following data represents the number of points scored by players on a high school basketball team this season.

Player 1           68        Player 6           128

Player 2           82        Player 7           66

Player 3           145      Player 8           54

Player 4           111      Player 9           221

Player 5           97        Player 10         99

1. Find the sample mean and the sample standard deviation.

Answer:  Sample Mean  1071 = 107.1  Sample Standard Deviation S = 3.16

10

1. Construct a 90% confidence interval for the population mean and interpret the results. Assume the population of the data set is normally distributed.

1. For the following statements, state the null and alternative hypotheses and identify which represents the claim. Determine when a type I or type II error occurs for a hypothesis test of the claim. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed, and explain your reasoning. Explain how you should interpret a decision that rejects the null hypothesis. Explain how you would interpret a decision that fails to reject the null hypothesis.

1. It is reported that the number of residents in Wisconsin who support plans to recall the governor is 48%.

1. An Amish bakery store states that the average shelf life of their fresh baked goods is seven days.

1. A soda manufacturer states that the average number of calories in the regular soda is less than 150 calories per serving.

1. The census figures show that the average income for a family in a rural region is approximately \$34,860 per year. A random sample has a mean income of \$33,566 per year, with a standard deviation of \$1,245. At a sig. level of .0.01 is there enough evidence to reject the claim? Explain.

1. An advertising firm claims that the average expenditure for advertising for their customers is at least \$12,500 per year. You want to test this claim, so you randomly select 10 of their customers. The results are listed below. At a sig. level of .01 can you reject this claim? Explain.

13,445             11,220             10,157             13,217             9,990

12,125             10,116             14,350             13,590             12,100

1. Find the critical value(s) for the indicated test for a population variance, sample size, and sig. level.

1. Right-tailed test – Sample Size (25), Significance (.05)

1. Two-tailed test – Sample Size (11), Significance (.01)

1. Two-tailed test – Sample size (66), Significance (.10)

1. Left-tailed test – Sample Size (18), Significance (.05)

1. The employees in a grocery store are handing out samples of a certain brand of Pizza. This is the pizza company’s way of determining whether people like the brand of pizza and would prefer it over other brands. Do you think this type of sampling is representative of the population? Explain. Identify possible flaws or biases in this study.

10.   Classify the following as independent or dependent and explain your answer.

a.      Sample 1 – The males in the class
Sample 2 – The females in the class

b.      Sample 1 – Blood Pressure of fifteen people in a nursing home

c.      Sample 2 – Blood pressure of the same fifteen people one week later

11.   A researcher claims that taking a protein supplement as part of a weight gainer program for athletes will help them gain muscle weight. The weights in pounds of 10 athletes are listed below before and after using the protein supplement.   At a sig. of .05 can you conclude that this supplement helps the athletes gain weight?

 Athlete 1 2 3 4 5 6 7 8 9 10 Weight Before 196 220 187 184 206 198 174 176 182 174 Weight After 198 224 185 185 213 196 178 180 175 174

12.   Technology: A math teacher claims that the average final exam scores for the seventh grade boys and girls are equal. The average score for 10 randomly selected boys is 87 with a standard deviation of 11. The average score for 10 randomly selected girls is 89 with a standard deviation of 12. State the null and alternate hypotheses. At a sig. of .05 can you reject the teacher’s claim? Assume normal distribution and equal variances. Please use Excel for your calculations. What is your analysis?

13.   Application: Create a small data set based on something you are interested in. You will need to form a null and alternate hypothesis and perform a one-sample test based on the sample. Discuss your analysis based on the output. If you are unsure of ideas for a data set, you can look online or in your text for ideas. However, do not copy word-for-word.

 Team Offense Scored Points Allowed Blazers 45 38 Blue Jays 42 45 Coyotes 39 38 Highlanders 48 45 Mountaineers 31 49 Rapid Falls 40 45 Tronado’s 39 37

Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Free Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.

Prompt Delivery and 100% Money-Back-Guarantee

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

## Calculate the price of your order

Total price:
\$0.00

How it works?

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.

## Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.