47 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 26.7 pounds. Assume that o =3.5 pounds.What is the 95% confidence interval for the true mean weight, u, of all packages received by the parcel service?025.3 to 28.1 poundsO 25.9 to 27.5 poundsO 25.8 to 27.6 poundsO 25.7 to 27.7 pounds

We want to find 95% CI for population mean μ

Answered: 47 packages are randomly selected from…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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One hundred and twenty Americans were surveyed about how much time per month they spend watching television. The survey found a sample mean of 140 hours with a sample standard deviation of 44 hours. Construct a 99% confidence interval for the meantime spent watching television per month. Lower______hours Upper______hours
Suppose that you wanted to estimate the population mean amount spent eating out per week by Gainesville families. In 2010, a survey found the sample standard deviation was 200 dollars. What size sample would you need to collect in order to make a 95% confidence interval with a margin of error of 15 dollars? O 683 O 27 O783 583
The speed of greyhounds is normally distributed with a standard deviation of 0.15 mph. How many dogs do we need in our sample to estimate the mean speed of all greyhounds to within 0.05 mph for a 95% confidence interval? 35 greyhounds 87 greyhounds 61 greyhounds 42 greyhounds
At the local fish hatchery we take a random sample of 21 trout from one of the holding pens. The trout in the sample have a mean length of 11.2 inches with a standard deviation of .73 inches. Construct and interpret a 95% confidence interval for the mean length of all trout in this holding pen. Type your interpretation sentence in the written response box.
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 4.2 minutes. The population standard deviation is known to be 0.6 minute. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 4 minutes. The test statistic is O a. 5.56 O b. 0.33 O c. 2.58 O d. 3.33
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Please answer all. Thank you. A national random sample of 20 NCAE Scores from 2010 is listed below. 29,26,13,23,23,25,17,22,17,19 12,26,30,30,18,14,12,26,17,18 Calculate the 95 percent confidence interval for the mean NCAE score if the sample standard deviation is about 5.9407. A.) between 18.22 and 23.48 B.) between 18.07 and 23.63 C.) between negative infinity and 23.15 D.) between negative infinity and 23.05 The value of z selected for constructing a given confidence interval is called A.) confidence B.) error C.) student D.) critical value
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