Reading proficiency: An educator wants to construct a 90% confidence interval for the proportion of elementary school children in Colorado who are proficientin reading.Part 1 of 3(a) The results of a recent statewide test suggested that the proportion is 0.79. Using this estimate, what sample size is needed so that the confidenceinterval will have a margin of error of 0.04?A sample of 281 elementary school children is needed to obtain a 90% confidence interval with a margin of error of 0.04.Part: 1/3Part 2 of 3(b) Estimate the sample size needed if no estimate of p is available.A sample ofelementary school children is needed to obtain a 90% confidence interval with a margin of error of 0.04.

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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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We wish to estimate what percent of adult residents in Ventura County like chocolate. Out of 300 adult residents sampled, 270 like chocolate. To construct a 90% confidence interval for the proportion (p) of adult residents who like chocolate in Ventura County, you need to use which one of the following calculator? Confidence Interval for a Population Proportion One-Way ANOVA Two Independent Proportions Comparison Two Independent Sample Means Comparison Given Statistics Two Dependent Sample Means Comparison Given Data Chi-Square Test for Independence Chi-Square Test for Goodness of Fit Two Independent Sample Means Comparison Given Data Confidence Interval for a Population Mean Given Statistics Hypothesis Test for a Population Mean Given Statistics Hypothesis Test for a Population Proportion Hypothesis Test for a Population Mean Given Data Confidence Interval for a Population Mean Given Data A. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents)…
A recent study of high school students shows the percentage of females and males who have an after-school job. A simple random sample of high school students was interviewed. The students were asked whether they worked after school. Of the 250 females, 58 answered yes, as did 113 of the 380 males. Part A: Construct and interpret a 95% confidence interval for the difference in population proportions of females and males who have an after-school job. Be sure to state the parameter, check conditions, perform calculations, and make conclusion(s). Part B: Does your interval from part A give convincing evidence of a difference between the population proportions? Explain.
You developed a simulation for the Walton bookstore example for company profits. According to your simulation results the mean profit is $204.13 with a standard deviation of $328.04. You want to build a 95% confidence interval of length $25 (i.e. the difference between the upper and lower limit of the confidence interval will be $25). Assume that the multiple for a 95% confidence level is 2. Compute the minimum number of replications required to build the desired confidence interval. a. 2000 to 3000 b.1000 to 2000 c. More than 4000 d. 3000 to 4000 e. Less than 1000
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Call me: A sociologist wants to construct a 95% confidence interval for the proportion of children aged 8-10 living in New York who own a smartphone. Part: 0 / 3 Part 1 of 3 (a) A survey by the National Consumers League estimated the nationwide proportion to be 0.38. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.04? A sample of children aged 8-10 living in New York is needed to obtain a 95% confidence interval with a margin of error of 0.04 using the estimate 0.38 for p. Skip Part. Check E 888 R $100 FO MacBook Air X Save For Later C 00 [110] Submit Assignment 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibilit
) For each problem below, Decide whether it describes a confidence interval for a proportion or a confidence interval for a mean. Apply the correct formula to calculate the confidence interval in the format of an estimate + margin of error. During the 2016 season, Mark Williams played in 18 golf matches and used his driver club 126 times, hitting his drives an average of 278 yards per drive, with a standard deviation of 15 yards per drive. Calculate a 95% confidence interval for the distance he was able to hit his driver club in that season.
Reading proficiency: An educator wants to construct an 80% confidence interval for the proportion of elementary school children in Colorado who are proficient in reading. Part 1 of 3 (a) The results of a recent statewide test suggested that the proportion is 0.64. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.03? A sample of 421 elementary school children is needed to obtain an 80% confidence interval with a margin of error of 0.03. Part: 1 / 3 Part 2 of 3 (b) Estimate the sample size needed if no estimate of p is available. A sample of elementary school children is needed to obtain an 80% confidence interval with a margin of error of 0.03.
Estimate the sample size needed if no estimate of p is available. PART B
The accompanying data set gives the additional sleep in hours obtained by a sample of 10 patients using a certain sleep aid. Preliminary data analyses indicate that the t-interval procedure can reasonably be applied. Complete parts (a) and (b) below. Click here to view the additional sleep hours. Click here to view page 1 of the t-table. Click here to view page 2 of the t-table. ..... a. Obtain and interpret a 99% confidence interval for the additional sleep that would be obtained on average for all people using the sleep aid. (Note: x = 2.50 hr and s= 2.017 hr.) The 99% confidence interval is from hour(s) to hour(s). (Round to two decimal places as needed.) Additional sleep hours 2.2 1.4 0.0 5.7 4.7 1.1 0.1 4.5 1.6 3.7 Print Done
Early-childhood-development studies indicate that the more often a child is read to from birth, the earlier the child begins to read. A local parents’ group wants to test this theory and samples families with young children. They find the following results. Construct a 99% confidence interval to estimate the true difference between the proportions of children who read at an early age when they are read to frequently compared to those who were read to less often, as described in the table of results. Let Population 1 be the children who were read to frequently and Population 2 be the children who were read to less often. Round the endpoints of the interval to three decimal places, if necessary. Ages when Children Begin to Read Read to at Least Three Times per Week Read to Fewer than Three Times per Week Started Reading by age 4 60 35 Started Reading after age 4 36 51 Lower end point: Upper end point:
A 95% confidence interval implies that: A. We are 95% confident that the interval contains the true population mean B. The interval range contains 95% of the values in your dataset C. There is a 5% chance the mean will be found in the CI range

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