**Lesson: 8.1 Estimating Population Means****Question 4 of 14, Step 1 of 1**A professor wants to estimate how many hours per week her students study. A simple random sample of 55 students had a mean of 18 hours of studying per week. Construct a 90% confidence interval for the mean number of hours a student studies per week. Assume that the population standard deviation is known to be 2.8 hours per week. Round to two decimal places.**Answer**- **Lower Endpoint:** [text box for answer]- **Upper Endpoint:** [text box for answer]Buttons available: - **Tables**- **Keypad**- **Keyboard Shortcuts****Submit Answer** [Button]© 2021 Hawkes Learning

We have given that Sample size n=55 , sample mean = 18 Population standard deviation =2.8 90%…

Answered: 3/14 Question 4 of 14, Step 1 of 1…

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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Question 1, 8.3.36
Arusi has a successful app that runs on the two common operating systems in the smartphone market. She wants to decide in which system to build new features by determining which system has users that spend more money.( significance level of 5%) System A System B Mean ＄10 ＄15 Standard deviation ＄3 ＄5 Number of users 67 65
Ideal Number of Children Frequency 0. 11 27 528 262 63 10 4. 8. 6. 0. 10 11 H23456
Q.1 At the end of every school year, the state administers a reading test to a sample of 36 third graders. The school system has 20,000 third graders, half boys and half girls. The results from last year's test are shown in the table below. Stratum Boys Girls Mean score 80 70 Standard deviation 10.27 6.66 This year, the researchers plan to use a stratified sample, with one stratum consisting of boys and the other, girls. Use the results from last year to answer the following questions? . To maximize precision, how many sampled students should be boys and how many should be girls? . What is the mean reading achievement level in the population? Compute the confidence interval. . Find the margin of error.
Chapter 16-13
O Question 9 A particular fruit's weights are normally distributed, with a mean of 718 grams and a standard deviation of 6 grams. If you pick 22 fruits at random, then 15% of the time, their mean weight will be greater than how many grams? Give your answer to the nearest gram. Question Help: D Video Submit Question P Type here to search (@ %23 2$ % & 3. 5 8. W E R tab Y D caps lock H %24
need solution for part C, please nand for part b need to select
DATAfile: Costco You may need to use the appropriate technology to answer this question. Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of ? = 13 is expected. In 2012, Costco, with its 432 warehouses in 40 states, was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores follows. 95 90 83 75 95 98 80 83 82 93 86 80 94 64 62 (a) What is the sample mean customer satisfaction score for Costco? (b) What is the sample variance? (Round your answer to two decimal places.) (c) What is the sample standard deviation? (Round your answer to two decimal places.) (d) Construct a hypothesis test to determine whether the population standard deviation of ? = 13 should be rejected for Costco. With a 0.05 level of significance, what is your conclusion?…
You have following observations -1.5, 2.6, 1.2, -2.1, 0.1, 0.9. Find a sample mean, a sample variance, construct an empirical distribution function.
When using 1-Var Stats on a scientific or graphing calculator, the resulting statistical output includes two values for the standard deviation of the data set. These values are labeled as Sxand σx in the statistical output. Why is it necessary to give two values for the standard deviation? How would you choose which one to use as the standard deviation of a data set you are working with? Be sure to explain the difference between these two values as you answer these questions
A quiz related to digital knowledge was conducted. The quiz had 10 questions and covered topics such as the purpose of browser cookies, phishing scams, and privacy policies. The survey was given to 50 people. The mean score is 4.1 with a standard deviation of 2.6. We want to know if the data provide evidence that the mean score in the population is lower than 5. We will use alpha = 0.05 to make our decision. part a. Is this a one-sided or two-sided test? part b. What is the standard error for this problem? part c. How many degrees of freedom do we have for this problem? part d. What is the test statistic, t, for this problem? Based on your test statistic and degrees of freedom, the p-value will be between what two values? (If you cannot find the exact df in the table, round down to be safe. So if you have 38 df, round down to 30df.) Group of answer choices The p-value is between .1 and .05 The p-value is between .05 and .025 The p-value is between .025 and .01 The p-value…
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