Computing Confidence

In the following exercises, you will compute confidence intervals using Excel. You will submit a single Excel file that includes your results for all of the exercises. For each exercise, please include the output from Toolpak (or whatever tool you are using), and make sure that you clearly show the following:

Confidence level
Whether you should use a normal distribution or t-distribution
Confidence interval in interval form, i.e., (lower bound, upper bound)
Confidence interval in margin of error form, i.e., sample mean ± margin of error.

Exercise#1: A health care professional wants to determine the systolic blood pressure of individuals with hypertension who take Atenolol. Thirty such individuals have an average systolic blood pressure of 105, with a sample standard deviation of 23. Find the 95% confidence interval for mean systolic blood pressure for hypertensive individuals who take Atenolol.

Exercise#2: In a study of the effectiveness of a certain anxiolytic on individuals experiencing panic attacks, out of a 120-person sample, 85 reported a decrease in panic attack frequency. Find the 95% confidence interval for the proportion of patients who experienced a reduction in panic attacks while on the anxiolytic.

Exercise#3: The following is a list of hospital stay durations, in days, of 16 new mothers after cesarean deliveries:

3, 4, 7, 3, 2, 3, 2, 1, 5, 4, 4, 8, 1, 3, 4, 6

Using this sample data, find the 98% confidence interval for the mean duration of post-cesarean hospital stay.

Exercise#4: A camp director is interested in the mean number of letters each child sends during his or her camp session. The population standard deviation is known to be 2.5. A survey of 20 campers is taken. The mean from the sample is 7.9. Find the 99% confidence interval for the mean number of letters.

Calculate the price of your order

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
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

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more

mahjong ways 2