Z ConnectHillModule 2 HW 14 (Section 7.2 Confidence Intervals for a|MATHHosted by ALEKS Corp.Population Mean, Standard Deviation Unknown)Question 4 of 5Sound it out: Phonics is an instructional method in which children are taught to connect sounds withletters or groups of letters. A sample of 131 first-graders who were learning English were asked toidentify as many letter sounds as possible in a period of one minute. The average number of lettersounds identified was 34.11 with a standard deviation of 23.91.Part 1 of 2(a) Construct a 99.5% confidence interval for the mean number of letter sounds identified in oneminute. Round the answers to at least two decimal places.A 99.5% confidence interval for the mean number of letter sounds identified in one minute is<µ<Part 2 of 2(b) If a 99% confidence interval were constructed with these data, would it be wider or narrowerthan the interval constructed in Part (a)?The confidence interval would be(Blank 1)Blank 1 Options• widernarrower

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Answered: Question 4 of 5 Sound it out: Phonics…

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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in a survey, 27 people were asked how much they spent on their child's last birthday gift. the results were roughly bell-shaped with a mean of $30 and sample standard deviation of $20. construct a confidence interval at a 95% confidence level.
Question 5 A common claim is that garlic lowers cholesterol levels. In a test of the effectiveness of garlic, 45 subjects were treated with doses of raw garlic, and their cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/mL) have a mean of 4.94 mg/mL and a standard deviation of 18.51 mg/mL. Construct a 95% confidence interval for the average net change in LDL cholesterol after the garlic treatment. i. Procedure: Select an answer Select an answer One proportion Z procedure One mean T procedure One mean Z procedure One variance x² procedure ii. Assumptions: (select everything that applies) Simple random sample Sample size is greater than 30 Population standard deviation is unknown Population standard deviation is known The number of positive and negative responses ar Normal population iii. Unknown parameter: Select an answer Select an answer u, population mean o², population variance p, population proportion
Two groups were selected for an experiment. The sample data is reported: Group A Group B Sample Mean Spending/day ($) 170 150 Sample Standard deviation ($) 10 5 # of Females 9 7 Sample Size 36 42 a. Set up a 99% confidence interval for the mean difference in spending between the two groups. b. At the 10% level test the alternate hypothesis that group B has lower spending level than Group A.
In a survey, 19 people were asked how much they spent on their child's lost birthday gift. The results were roughly bellshaped with a mean of $46 and standard deviation of $8. Construct a confidence Interval at a 99% confidence level Give your answers to one decimal place:
Nielsen Media Research conducted a study of household television viewing time during the 7PM to 10PM time period (This is known as Prime Time). The average weekly time spent watching was 785 minutes. This was based off 600 randomly selected households. Based upon past studies the population standard deviation is known to be 65 minutes. Develop an 80% confidence interval for the average time Americans watched prime-time TV this week.
Question 6 Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 41 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 14.3 and a standard deviation of 2.2. What is the 90% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? Enter your answers accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). Submit Question
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Question 82 parts A, B, and C
Hip surgery: In a sample of 129 hip surgeries, the average surgery time was 138.1 minutes with a standard deviation of 23.3 minutes. A. Construct a 99% confidence interval for the mean surgery time for this procedure. Round the answer to one decimal place.
Phonics is an instructional method in which children are taught to connect sounds with letters or groups of letters. A sample of 135 first graders who were learning English were asked to identify as many letter sounds as possible in a period of one minute. The average number of letter sounds identified was 34.04 with a standard deviation of 23.62. (A) construct an 80% confidence interval for the mean number of letter sounds identified in one minute.
Question 6 Is smoking during pregnancy associated with premature births? To investigate this question, researchers selected a random sample of 118 pregnant women who were smokers. The average pregnancy length for this sample of smokers was 255 days. From a large body of research, it is known that length of human pregnancy has a standard deviation of 16 days. The researchers assume that smoking does not affect the variability in pregnancy length. Find the 95% confidence interval to estimate the length of pregnancy for women who smoke. (Note: The critical z-value to use, Ze, is: 1.960) ) Your answer should be rounded to 3 decimal places.

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