12.70 (C2)The article "The Association Between Television Viewing andIrregular Sleep Schedules Among Children Less Than 3 Yearsof Age" (Pediatrics [2005]: 851-856) reported the accompany-ing 95% confidence intervals for average TV viewing time(in hours per day) for three different age groups.95% Confidence IntervalAge Group2adaBeodolgmLess than 12 Months(0.8, 1.0)n z (1.4, 1.8) b n12 to 23 MonthsTsq 24 to 35 Months nsom odi (2.1, 2.5)celbet &L9a. Suppose that the sample sizes for each of the three age-group samples were equal. Based on the given confidencegai intervals, which of the age-group samples had the great-ton est variability in TV viewing time? Explain your choice.b. Now suppose that the sample standard deviations for thethree age-group samples were equal, but that the threesample sizes might have been different. Which of thethree age-group samples had the largest sample size?ali Explain your choice.c. The interval (0.7, 1.1) is either a 90% confidence intervalalg or a 99% confidence interval for the mean TV viewingolo time calculated using the sample data for children lessthan 12 months old. Is the confidence level for this inter-val 90% or 99%? Explain your choice.

(a) According to the provided data, the age group 24 to 35 months is the one with greater…

Answered: 12.70 (C2) The article "The Association…

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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Researchers collected data on the numbers of hospital admissions resulting from motor vehicle crashes, and results are given below for Fridays on the 6th of a month and Fridays on the following 13th of the same month. Friday the 6th. Friday the 13th. 10 14 7 13 11 14 11 10 3 6 14 Construct a 95% confidence interval estimate of the mean of the population of differences between hospital admissions on days that are Friday the 6th of a month and days that are Fridays the 13th of a month. Use the confidence interval to test the claim that when the 13th day of a month falls on a Friday, the numbers of hospital admissions from motor vehicle crashes are not affected.
The article “Application of Surgical Navigation to Total Hip Arthroplasty” (T. Ecker and S.Murphy, Journal of Engineering in Medicine, 2007:699–712) reports that in a sample of 123 hipsurgeries of a certain type, the average surgery time was 136.9 minutes with a standard deviationof 22.6 minutes.a) Find a 95% confidence interval for the mean surgery time for this procedure.b) Find a 99.5% confidence interval for the mean surgery time for this procedure.c) A surgeon claims that the mean surgery time is between 133.9 and 139.9 minutes. Withwhat level of confidence can this statement be made?d) Approximately how many surgeries must be sampled so that a 95%confidence intervalwill specify the mean to within ±3 minutes?e) Approximately how many surgeries must be sampled so that a 99%confidence intervalwill specify the mean to within ±3 minutes?
Construct a 95% confidence interval for the difference between the two means Treatment Group Control Group n1 =78 n2=70 X1= 179.1 X2 213.7 s1 =35.7 s2= 37.2
7 FI A random sample of ni = 246 people who live in a city were selected and 70 identified as a "dog person." A random sample of n2 Find the 99% confidence interval for the difference in the proportion of people that live in a city who identify as a "dog person" and the proportion of people that live in a rural area who identify as a "dog person.' %3D 112 people who live in a rural area were selected and 62 identified as a "dog person." %3D Round answers to to 4 decimal places. Question Help: Message instructor Submit Question MacBook Pro %23 % 3. 00 R. S. H. K.
1 Suppose that the average time spent per day with digital media several years ago was 3 hours and 22 minutes. For last year, a random sample of 20 adults in a certain region spent the numbers of hours per day with digital media given in the accompanying table. Preliminary data analyses indicate that the t-interval procedure can reasonably be applied. Find and interpret a 90% confidence interval for last year's mean time spent per day with digital media by adults of the region. (Note: x=5.88hr and s=2.27hr.) The 90% confidence interval is from ( ? ) hour(s) to ( ? )hour(s). Interpret the 90% confidence interval. Select all that apply. A. There is a 90% chance that the mean amount of time spent per day on digital media last year by all adults in the region is between the interval's bounds. B.With 90% confidence, the mean amount of time spent per day on digital media last year by all adults in the region is between the interval's bounds. C.90% of all…
A random sample of 250 SCC students yields 79 full-timers and 171 part-timers. (a)Construct a 90% confidence interval for the overall proportion of full-time students at SCC.(b)The margin of error associated with the above c.i. is_____(c)How large a sample should be selected if we want the margin of error to be 2 percentage points?
Group Number of Children Mean PEF Std Dev PEF Chronic Bronchitis 25 281 68 No Chronic Bronchitis 25 319 74 Using the data presented above: a) Construct a 95% confidence interval for the mean PEF in children without chronic bronchitis b) Determine how many children would be required to ensure that the margin of error in (a) does not exceed 10 units.

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