OBODQUESTION 11A random sample of 40 adults has a mean annual earnings of $3120. Assume the population standard deviation is $677. Construct the 95 confidence interval for the population mean.O (54812, $5342)O6210, $110)O(S1987, $2346)(52910, $3330)QUESTION 12A random sample of 10 athletes showed thhe following values for miles run per day Find the 95% confidence interval for the true mean number of miles run per day by athletes. Assume the miles run are normally distributed and the sample standard deviation isClick Save nd Submit o saeand s n CluSe All Answers to saueallanerSave AAnsere to searchEUG26

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Answered: QUESTION 11 A random sample of 40…

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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Question 3 The average score of all sixth graders in school District A on a math aptitude exam is 75 with a standard deviation of 8.1. A random sample of 80 students in one school was taken. The mean score of these 100 students was 71. Does this indicate that the students of this school are significantly different in their mathematical abilities than the average student in the district? Use a 5% level of significance.
Question 4 The number of points the Raptors have scored against the Celtics in the last 10 games is the following: 97, 88, 115, 125, 106, 114, 100, 113, 102, 106 Suppose that the number of points Raptors score against the Celtics is normally distributed with a standard deviation of 7. The Raptors play the Celtics this week. Find the 95% prediction interval for the true mean number of points that the Raptors will score against the Celtics. Round your answers to one decimal place. O (91.2, 122.0) (92.2, 121.0) (91.9, 121,3) (91.5, 121.7)
question 20 The amount of time that people spend at Grover Hot Springs is normally distributed with a mean of 71 minutes and a standard deviation of 16 minutes. Suppose one person at the hot springs is randomly chosen. Let X = the amount of time that person spent at Grover Hot Springs . Round all answers to 5 decimal places where possible. c. The park service is considering offering a discount for the 8% of their patrons who spend the least time at the hot springs. What is the longest amount of time a patron can spend at the hot springs and still receive the discount ? minutes.d. Find the Inter Quartile Range (IQR) for time spent at the hot springs.Q1: minutesQ3: minutesIQR: minutes
Question 8 ▼ A researcher is interested in finding a 95% confidence interval for the mean number of times per day that college students text. The study included 107 students who averaged 29.1 texts per day. The standard deviation was 18.2 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? distribution. texts. b. With 95% confidence the population mean number of texts per day is between c. If many groups of 107 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain percent will not contain the tr the true population number of texts per day population mean number of texts per day. Submit Question Question Help: Written Example Message instructor about a and a
Question 2 A researcher is interested in finding a 98% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 149 students who averaged 37.9 minutes concentrating on their professor during the hour lecture. The standard deviation was 10.6 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a? distribution. b. With 98% confidence the population mean minutes of concentration is between minutes. c. If many groups of 149 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean minutes of concentration and about percent will not contain the true population mean minutes of concentration. Hint: Hints Video [+] Submit Question and MacBook Air
Question 6 The patient recovery time from a particular surgical procedure is normally distributed with a mean of 3 days and a standard deviation of 2 days. Let X be the recovery time for a randomly selected patient. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X - N( b. What is the median recovery time? c. What is the Z-score for a patient that took 4.8 days to recover? days d. What is the probability of spending more than 3.6 days in recovery? e. What is the probability of spending between 2.8 and 3.8 days in recovery? f. The 85th percentile for recovery times is Wint days. MacBook Air
Imagine that a study of memory and aging finds that younger participants correctly recall 55% of studied words, older participants correctly recall 42% of studied words, and the size of this effect is Cohen's d = 0.49. This effect size indicates that the memory performance of: Question 10 options: younger participants is approximately half a standard deviation below that of older participants. older participants is approximately half a standard deviation below that of younger participants. younger participants is significantly lower than that of older participants. older participants is approximately 4 standard deviations below that of younger participants.
Question 7: give the test statistic
QUESTION 5 A random sample of n = 144 is drawn from a population with a known standard deviation of o= 14.1. The sample mean is x= 95. What is the 90% confidence interval for the population mean? O a. (93.07, 96.93) O b.(93.49, 96.51) O c. (92.70, 97.30) O d. (92.27, 97.73)

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QUESTION 11 A random sample of 40 adults has a mean annual earnings of $3120. Assume the population standard deviation is $677. Con struct the 95% confidence interval for the population mean. O ($4812, $5342) O ($210, $110) O ($1987, $2346) (52910, $3330)