According to WHO, adolescents should spend at least an hour per day of moderate-to-vigorous intensityphysical activity and should limit the time spent being sedentary.Based on this recommendation, a researcher wanted to estimate the mean sedentary time (sitting whilewatching TV, in a car, or while playing gadgets) of adolescents at 95% confidence level. In the study, a randomsample of 25 adolescents spent an average of 8.76 hours per day being sedentary.Suppose that sedentary times are normally distributed with a standard deviation of 1.75 hour per day.✔●The 95% confidence interval for the mean sedentary time (hours per day) of adolescents is[ Select]Complete the statement:If we consider all possible samples of the same size and a 95% confidence interval is obtained from each sample,then [Select]For a second study, what sample size (minimum) would you recommend so that the estimated meansedentary time is within 0.5 hour at 95% confidence level? [Select] According to WHO, adolescents should spend at least an hour per day of moderate-to-vigorous intensityphysical activity and should limit the time spent being sedentary.Based on this recommendation, a researcher wanted to estimate the mean sedentary time (sitting whilewatching TV, in a car, or while playing gadgets) of adolescents at 95% confidence level. In the study, a randomsample of 25 adolescents spent an average of 8.76 hours per day being sedentary.Suppose that sedentary times are normally distributed with a standard deviation of 1.75 hour per day.●●The 95% confidence interval for the mean sedentary time (hours per day) of adolescents is[Select]Complete the statement:If we consider all possible samples of the same size and a 95% confidence interval is obtained from each sample,then[Select][Select]Neither A nor BBoth A and B. For aA. 95% of these intervals would contain the true mean sedentary time of adolescents estimated meanB. 95% of all adolescents would have sedentary times within the interval estimatesedentary time is within 0.5 hour at 95% confidence level? [Select]

Given:- n=25, x¯=8.76, σ=1.75 To calculate 95% confidence interval of a normally distributed…

Answered: On this recommendation, a researcher…

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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During 2008, college work-study students earned a mean of $1478. Assume that a sample consisting of 25 of the work-study students at a large university was found to have earned a mean of $1503 during that year, with a standard deviation of $210. Formulate the null and alternative hypotheses that can be used to suggest that the average earnings of this university’s work-study students were significantly higher than the national mean
The principal at a large high school claims that students spend at least 10 hours per week doing homework, on average. To investigate this claim, an AP Statistics class selected a random sample of 250 students from their school and asked them how long they spent doing homework during the last week. The sample mean was 10.2 hours and the sample standard deviation was 4.2 hours. Construct and interpret a 95% confidence interval for the mean time that students at this school spent doing homework in the last week. Based on your interval, what can you conclude about the principal's claim? What is your t* value? Remember to use the conservative DF value.
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