The time needed for college students to complete a certain paper and pencil maze follows a Normal distribution, with a mean of 80 seconds and a standard deviation of 6 seconds. You wish to see if the mean time is changed by meditation, so you have a group of 8 college students meditate for 30 minutes and then complete the maze. It takes them an average of = 74 seconds to complete the maze. Use this information to test the hypotheses H 0: = 80, H a: 80 at significance level = 0.02. You conclude that: a.H0 should not be rejected. b.Ha should be accepted. c.H0 should be rejected. d.this is a borderline case and no decision should be made. The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with = 100 and = 11. The proportion of adults with scores above 110 is closest to: a.0.14. b.0.25. c.0.33. d.0.18.

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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 time needed for college students to complete a certain paper and pencil maze follows a Normal distribution, with a mean of 80 seconds and a standard deviation of 6 seconds. You wish to see if the mean time is changed by meditation, so you have a group of 8 college students meditate for 30 minutes and then complete the maze. It takes them an average of = 74 seconds to complete the maze. Use this information to test the hypotheses H ₀: = 80, H _a: 80 at significance level = 0.02. You conclude that:

a.
H₀ should not be rejected.

b.
H_a should be accepted.

c.
H₀ should be rejected.

d.
this is a borderline case and no decision should be made.
1. The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with = 100 and = 11. The proportion of adults with scores above 110 is closest to:
  
  a.
  0.14.
  
  b.
  0.25.
  
  c.
  0.33.
  
  d.
  0.18.

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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