4. The time it takes to turn in a homework assignment is assumed to be normally distributed. Arandom sample of 15 students was selected and the time (days) it took for each one to turn intheir most recent homework assignment is as follows: (6, 6, 2, 3, 10, 2, 4, 4, 5, 3, 6, 6, 5, 4, 6).a. Find a point estimate for the typical number of days it takes students to hand in theirhomework assignmentb. Construct a 90% confidence interval for the mean number of days and interpret

( a ) Point estimate =? ( b ) Construct 90% C.I

Answered: 4. The time it takes to turn in a…

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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The following table shows time in minutes required to check out nine randomly selected customers Ina grocery store. 3,4,2,5,4,1,5,5,4. Construct a frequency distribution for the data set. B) identify the mode of this data set
Maryland, as the four U.S. cities with the highest percentage of millionaires (Kiplinger website). Consider a sample of data that show the following number of millionaires for samples of individuals from each of the four cities. Millionaire Cannot conclude Bridgeport, CT CA San Jose, CA Yes 42 36 No 458 264 a. What is the estimate of the percentage of millionaires in each of these cities (to 1 decimal)? 0.436 Use Table 3 of Appendix B to find the p-value. The p-value is greater than 0.10 What is your conclusion? City Washington, D.C. 35 365 Bridgeport, San Jose, Washington, Lexington Park, CT D.C. MD Lexington Park, 46 27.4 Percentage, % 36.5 b. Using a = 0.05 level of significance, test for the equality of the population proportion of millionaires for these four cities. What is the p-value? Compute the value of the x² test statistic (to 3 decimals). 36.5 MD 33 367 that there is a difference among the population proportion of millionaires for these four cities.
The 18 faculty members in a college Economics department range in age from 32 to 68 as presented in the step plot below. If the oldest faculty member retires and is replaced by a 26-year-old, the median age will: 324899 403569 534789 9 638 O decrease by 2 years. O stay the same. O increase by 2 years. increase by 4 years.
The following data represent the weights (kg) of a sample of the 37 students in one of the colleges. What is required: Create the frequency distribution table for these data: 100 , 65 , 70, 83 , 94, 55, 46 , 47.8 , 62.3 , 77.2, 61.3, 62.9, 66.5 , 66.9 , 68.3 , 70 , 73.2, 73.8 , 82.4, 58.2, 59.9, 54.4, 58.7, 52.6, 51.8, 74.1, 80.2, 75.1, 78.3, 58.5 , 62, 66.3, 65, 67.1, 88.2, 89.1 , 80.1, 76.3
R2
SKIP IF YOU ALREADY DID THIS
A statistics teacher asked two different students, Lexie and Jennifer, to go to Wegmans and sample 30 shoppers each. The population of interest for both people can be defined as, “People who shop at the Johnson City, NY Wegmans store”. Here is what each person did to collect their sample: Lexie: She stood outside at the entrance to the store on 3 different days and times and surveyed every 15th person to walk by her. She surveyed 10 people each time to get her 30. Jennifer: She went to Wegmans after her nursing shift first thing Wednesday morning to buy deodorant since she ran out. When she was in the pharmacy area she surveyed all the people around her and then, to get up to 30 surveys, she went to the health food section and surveyed everyone she was there. Identify at least 2 specific reasons why Lexie’s approach is more likely to give a representative sample. Consider sources of bias, or types of shoppers who might be excluded by Jennifer’s approach.…
Suppose you compile all possible samples of 25 children of preschool age in your school district. If you calculate the mean of each sample (M) and create a frequency distribution of these means, this distribution is referred to as the
Suppose I want to sample the household incomes for EBR parish. Let's say I start with a simple random sample of 100 residents and calculate the sample mean. How would the sampling distribution of change if I increase the sample size to 1,000 residents?
Find sample kurtosis and geometric mean for data 36,65,185,246,248,313,341,342,372,457,495,599,601,608,832,871
Show all your work. Indicate clearly the methods you use, because you will be scored on the correctness of your methods as well as on the accuracy and completeness of your results and explanations. A bank categorizes its customers into one of three groups based on their banking habits. A random sample of 30 customers from each group was selected, and the number of times each customer visited the bank during the past year was recorded. The following table shows the summary statistics. Group n x¯ s A 30 48 7 B 30 51 8 C 30 54 10 The bank manager will investigate whether there is a significant difference in mean numbers of bank visits for the groups. Multiple two-sample t-tests will be conducted, each at the significance level of α=0.05.
5. To illustrate that s2 measures the spread, compute s2 for the two samples 109, 110, 111 and 105, 110, 115, and compare.

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