The testing times for a group of college students were normally distributed with a mean of μ = 33 minutesand a standard deviation of o 2 minutes.The bell curve below represents the distribution for testing times. The scale on the horizontal axis is equalto the standard deviation.Fill in the indicated boxes.μ-30 μ-20 μ-μ-o μ μ+o μ+20 μ+30Used the Empirical Rule to complete the following statements:68% of testing times were between 31 o minutes and95% of testing times were betweenμ = 33σ=299.7% of testing times were between50% of testing times were belowminutes andminutes andminutes.minutes.minutes.minutes.

given data normal distributionμ = 33σ = 2 empirical rule : approximately 68-95-99.7% data fall…

Answered: The testing times for a group of…

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 average monthly, entry-level salary for fresh graduates was reported as $2,800. A recruiting agency believed that the mean salary of fresh entry is lower than this. The recruiting office randomly surveyed 25 entry-level graduates and found that the sample means salary is $2,200, and the sample standard deviation is $1800. Assuming t- distribution is followed, answer the following questions. Use: H0 : u>2800 H1 : u
Lecture(8.6): In a statistic class 8 students took their pulse before and after writing a quiz to see if their mean pulse rate changed. A summary of the result is given below: Student 1 2 3 4 5 6 7 8 Pulse before: 98 87 74 75 85 96 85 70 Pulse after : 101 86 72 74 83 99 85 65 test the hypothsese at(alpha =.05) level of signifcance
A series of sodium chloride samples are analyzed and the following results were recorded: Sample # 1 2 3 4 % chloride 23.02 23.41 23.15 23.12 Calculate: The deviation of each result
The shape of a given population distribution is normal with a mean of μ = 85 and a standard deviation of o= 6.5. For these parameters, transform a raw score of X = 100.5 into its corresponding z score. Round to the nearest tenths place if a fraction. The z score is: O 2.4 -3.7 -3.4 09.2 The correct z-score is not listed.
According to United States Department of Agriculture, the average retail price of conventional whole milk at New York City in the year 2020 (up to November 2020 considered) is $3.92 per gallon. The standard deviation in the retail prices in the year 2020 (up to November 2020 considered) is $0.084. You are given a task of selecting randomly a sample of 85 milk bottles (whole milk of 1 gallon volume). a. Calculate µx̅ and σx̅. b. What is the approximate probability that the sample has a mean retail price that exceeds $4.05? c. What is the approximate probability that the sample has a mean retail price between $3.91 and $3.94?
The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-shaped distribution. This distribution has a mean of 44 and a standard deviation of 11. Using the empirical rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 22 and 55?Do not enter the percent symbol.ans = ___________ %
The average speed of 100 random cars traveling on a certain highway was 80 km/h. From past information, we can assume that the standard deviation of the population is 20 km/h. What is the margin of error with a 99% level of confidence for the population average ?speed :Select one a. 5.152 O b. 2.326 O c. 2.564 O d. 1.282 O e. 2.576 O f. 4.652 O
The following data set are four replicas for the measurements of the concentration in Molarity of NaCl in Human Serum (0.161, 0.163, 0.165, and 0.169) calculate: The arithmetic mean or sample mean The Median The sample standard deviation The range or spread Conduct the t-student’s test with 95% confidence
Consider the following data: x 4 5 6 7 8 P(X = x) 0.2 0.2 0.1 0.2 0.3 Step 3 of 5: Find the standard deviation. Round your answer to one decimal place. Copy Data
The mean volume of a large population of vials used to be 10.9 ml. To test whether this value has decreased, a random sample of size 300 vials are measured and found to have a sample mean of 10.5 ml. We will assume that the population of vial volumes is normally distributed with standard deviation of 3.6 ml. Test whether the mean population volume has decreased at a level of significance of 1%. Show your relevant steps below. Step 1: Hypotheses: • The null hypothesis Ho is (choose one): µ = 10.9 X = 10.5 x = 10.9 u = 10.5 • For the alternative hypothesis Ha we change the equal sign in Ho to (choose one):
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The data given below are the weights for a sample of babies. Assume the population of birth weights is normally distributed with a mean of μ= 7.10 DATA: 6.88 6.00 8.19 7.44 7.06 5.06 8.38 7.44 8.31 6.38 What is the mean weight in our sample? What is the standard deviation of our sample? What is the z-score for the heaviest baby in the sample? Give both the X-value and the z-score. What is the z-score for the lightest baby in the sample? Give both the X-value and the z-score. Assuming the distribution of birth weights is normally distributed, what percent of the babies in this distribution weigh more than our heaviest baby?

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