University:
Skagit Valley College
Course:
MATH 146 | Introduction to Stats
Academic year:

2023
Views:

304

Pages:

4
Author:

M. Hamilton

Name: Miallamittan Math& 146 Fall 2023 Worksheet 06, 50 points Content: Introductory Statistics, 5.1-6.2 Due: Thursday, November 9 You may either fum this in at the end of class Thursday, 11/9, or upload a pdf version of your worksheet to Canvas by 11:59pm on Thursday, 11/9. Write probabilities as decimals (rounded to four decimal places) Show your setup for each computational problem (as demonstrated in class). Each problem is worth 10 points. Your final score will be scaled out of 50 points: points correct 80 x 50 1) Use the following confidence interval to find the appropriate point estimate and the margin of error, E. Round your answers to the same number of decimal places presented in the interval below. Clearly label each answer with the appropriate symbol. 0.855 0.897 C0.897-0.855) -0,021 0.855+0.897 P=0876 2) The confidence interval estimates for the mean time spent waiting in customer service lines on Black Friday at Walmart and Target are given below. Walmart: 2.58 min <µ< 5.41 min Target: 0.62 min < µ < 2.10 min Do these intervals suggest that the mean wait times at Walmart and Target could be the same? Explain. No the mean waittines at Walmart Farget are not the same be cause the upper baind of target's wait times lower than walmarts lower bound 3 because the im or target could never be the in of Walmart, 3) A car manufacturer claims that the distances that their new electric car can travel on a single charge are normally distributed with 241 miles and 35.2 miles A consumer advocacy group randomly selected and tested 37 of these vehicles and measured the distance each car could travel on a single charge. The mean distance traveled by this sample was 225 miles. Find the probability that the mean distance traveled by a randomly selected sample of 37 vehicles would 225 miles or less. Label and shade the distribution. Round your answer to 4 decimal places, if needed. 4) Based on your answer to problem 3, does the probability of randomly selecting 37 cars with a mean travel distance of 225 miles or less suggest anything about the manufacturer's claim that the mean travel distance of all their cars is 241 miles? Explain. The probability of randomly celecting 37 cars that hout a mean of 225 would be unlikely to support the claim made because the Probility is less than 0.05.