Question 2A researcher is interested in finding a 98% confidence interval for the mean number minutesstudents are concentrating on their professor during a one hour statistics lecture. The studyincluded 149 students who averaged 37.9 minutes concentrating on their professor during thehour lecture. The standard deviation was 10.6 minutes. Round answers to 3 decimal placeswhere possible.a. To compute the confidence interval use a? distribution.b. With 98% confidence the population mean minutes of concentration is betweenminutes.< >c. If many groups of 149 randomly selected members are studied, then a different confidenceinterval would be produced from each group. Aboutpercent of these confidenceintervals will contain the true population mean minutes of concentration and aboutpercent will not contain the true population mean minutes of concentration.Hint: HintsVideo [+]Submit QuestionandMacBook Air

Given that: Sample size, n = 149 Sample mean, x¯=37.9 Population standard deviation, σ=10.6

Answered: A researcher is interested in finding 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 WAIS is an IQ test. Scores on the WAIS for the 20-34 age group are normally distributed with a mean 110 and a standard deviation of 25. Scores for the 60-64 age group are normally distributed with a mean of 90 and a standard deviation of 25. Find the percent of 20-34-year-olds that have an IQ greater than 120. a. 16% b. z= 0.4 or 40% c. 0.6554 or 65.54% d. 0.3446 or 34.46%
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A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 149 students who averaged 34.2 texts per day. The standard deviation was 18.6 texts. Round to 3 decimals. b. With 90% confidence the population mean number of texts per day is between _______ and ________ texts a day.
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