some text

Statistics 19 mcqs | Statistics homework help

 The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 94 inches, and a standard deviation of 14 inches. What is the probability that the mean annual snowfall during 49 randomly picked years will exceed 96.8 inches? (Points : 5)
0.0808
0.0026
0.4192
0.5808
 

6. Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.
With n = 18 and p = 0.30, estimate P(6). (Points : 5)
0.1015
0.8513
0.1958
0.1239
 

7. Use the normal distribution to approximate the desired probability.
A coin is tossed 20 times. A person, who claims to have extrasensory perception, is asked to predict the outcome of each flip in advance. She predicts correctly on 14 tosses. What is the probability of being correct 14 or more times by guessing? Does this probability seem to verify her claim? (Points : 5)
0.4418, no
0.0582, no
0.4418, yes
0.0582, yes
 

8. Solve the problem.
The following confidence interval is obtained for a population proportion, p: 0.689 < p < 0.723. Use these confidence interval limits to find the margin of error, E. (Points : 5)
0.017
0.706
0.018
0.034
 

9. Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decimal places.
95% confidence; n = 320, x = 60 (Points : 5)
0.0449
0.0514
0.0428
0.0385
 

10. Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p.
n = 51, x = 27; 95% confidence (Points : 5)
0.414 < p < 0.644
0.392 < p < 0.666
0.391 < p < 0.667
0.413 < p < 0.645
 

11. Use the given data to find the minimum sample size required to estimate the population proportion.
Margin of error: 0.004; confidence level: 95%; unknown (Points : 5)
60,148
60,018
60,025
50,024
 

12. Solve the problem. Round the point estimate to the nearest thousandth.
Find the point estimate of the proportion of people who wear hearing aids if, in a random sample of 304 people, 20 people had hearing aids. (Points : 5)
0.063
0.066
0.934
0.062
 

13. Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p.
A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the true proportion of all voters in the state who favor approval. (Points : 5)
0.471 < p < 0.472
0.435 < p < 0.508
0.438 < p < 0.505
0.444 < p < 0.500
 

14. Solve the problem.
A newspaper article about the results of a poll states: “In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 5 percentage points in either direction from what would have been obtained by interviewing all voters in the United States.” Find the sample size suggested by this statement. (Points : 5)
544
664
27
385
 

16. Use the confidence level and sample data to find a confidence interval for estimating the population mu. Round your answer to the same number of decimal places as the sample mean.
Test scores: n = 92, mean = 90.6, sigma = 8.9; 99% confidence (Points : 5)
88.4 < mu < 92.8
88.8 < mu < 92.4
88.2 < mu < 93.0
89.1 < mu < 92.1
 

17. Use the given information to find the minimum sample size required to estimate an unknown population mean mu.
Margin of error: $120, confidence level: 95%, sigma = $593 (Points : 5)
133
94
83
66
 

18. Assume that a sample is used to estimate a population mean mu. Use the given confidence level and sample data to find the margin of error. Assume that the sample is a simple random sample and the population has a normal distribution. Round your answer to one more decimal place than the sample standard deviation.
95% confidence; n = 91; x-bar = 16, s = 9.1 (Points : 5)
1.71
4.10
1.63
1.90
 

19. Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu. Assume that the population has a normal distribution.
A laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 225 milligrams with s = 15.7 milligrams. Construct a 95% confidence interval for the true mean cholesterol content of all such eggs. (Points : 5)
215.0 mg < mu < 235.0 mg
216.9 mg < mu < 233.1 mg
214.9 mg < mu < 235.1 mg
215.1 mg < mu < 234.9 mg

 

Order a unique copy of this paper
(550 words)

Approximate price: $22

Place Order
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

We value our customers and so we ensure that what we do is 100% original..
With us you are guaranteed of quality work done by our qualified experts.Your information and everything that you do with us is kept completely confidential.

Zero-plagiarism guarantee

The Product ordered is guaranteed to be original. Orders are checked by the most advanced anti-plagiarism software in the market to assure that the Product is 100% original. The Company has a zero tolerance policy for plagiarism.

Read more

Free-revision policy

The Free Revision policy is a courtesy service that the Company provides to help ensure Customer’s total satisfaction with the completed Order. To receive free revision the Company requires that the Customer provide the request within fourteen (14) days from the first completion date and within a period of thirty (30) days for dissertations.

Read more

Privacy policy

The Company is committed to protect the privacy of the Customer and it will never resell or share any of Customer’s personal information, including credit card data, with any third party. All the online transactions are processed through the secure and reliable online payment systems.

Read more

Fair-cooperation guarantee

By placing an order with us, you agree to the service we provide. We will endear to do all that it takes to deliver a comprehensive paper as per your requirements. We also count on your cooperation to ensure that we deliver on this mandate.

Read more

Calculate the price

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency