San Antonio Community College Statistics Worksheet
Learning Activity Modules 5 and 6Name_______________________
Please show all work or no credit will be given. Make sure you are using Microsoft Word to
open this assignment to ensure all questions are opening correctly.
1. According to the National Center for Health Statistics, 22.4% of adults are smokers. A random sample
of 300 adults is obtained.
a) Describe the sampling distribution of 𝑝̂ , the sample proportion of adults who smoke. (6 points)
b) In a random sample of 300 adults, what is the probability that at least 50 are smokers? (5 points)
c) Would it be unusual if a random sample of 300 adults results in 18% or less being smokers? Please
explain. (6 points)
2. Clayton Kershaw of the Los Angeles Dodgers is one of the premier pitchers in baseball. His most
popular pitch is a four-seam fastball. The data below represent the pitch speed (in miles per hour) for a
random sample of 18 of his four-seam fastball pitches.
a) Is “pitch speed” a quantitative or a qualitative variable? (1 point)
b) Draw a boxplot and check to see if the data set has any outliers. Does the data set has any outliers? (5
c) Assuming the requirements for constructing a confidence interval for the mean are satisfied,
Construct and interpret a 95% confidence interval for the mean pitch speed of a Clayton Kershaw fourseam fastball. (6 points)
We've got everything to become your favourite writing service
Money back guarantee
Your money is safe. Even if we fail to satisfy your expectations, you can always request a refund and get your money back.
We don’t share your private information with anyone. What happens on our website stays on our website.
Our service is legit
We provide you with a sample paper on the topic you need, and this kind of academic assistance is perfectly legitimate.
Get a plagiarism-free paper
We check every paper with our plagiarism-detection software, so you get a unique paper written for your particular purposes.
We can help with urgent tasks
Need a paper tomorrow? We can write it even while you’re sleeping. Place an order now and get your paper in 8 hours.
Pay a fair price
Our prices depend on urgency. If you want a cheap essay, place your order in advance. Our prices start from $11 per page.