Homework Answers
40 Percentile = 0.40
Looking for the probability 0.40 in standard normal table to calculate critical value Z
X = 27.965 
28.0
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Normal Distribution Q6
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QUESTION 16 A normally distributed population of adult American men heights has a mean of 57.8...
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61. The figure above shows the standard normal distribution, with mean 0 and standard deviation 1,...
61. The figure above shows the standard normal distribution, with mean 0 and standard deviation 1, including approximate percents of the distribution corresponding to the six regions shown. The random variable Y is normally distributed with a mean of 470, and the value Y = 340 is at the 15th percentile of the distribution. Of the following, which is the best estimate of the standard deviation of the distribution? A. 125 B. 135 C. 145 D. 155 E. 165
1. Use Table A to find the proportion of observations from a standard Normal distribution that...
1. Use Table A to find the proportion of observations from a standard Normal distribution that satisfies each of the following statements. In each case, sketch a standard Normal curve and shade the area under the curve that is the answer to each question. a. z<-1.83 b.z > 2.18 c. Z>-0.51 d. z <0.33 e. 1.42<z <2.68 f.-2 <2<1.53 X is a normally distributed variable with mean u = 30 and standard deviation o = 4. Find the following: a....
7. Determine whether a normal distribution or a normal distribution or t distribution should be used...
7. Determine whether a normal distribution or a normal distribution or t distribution should be used or whether neither of should be used to construct a confidence interval for the mean. (Section 6.2) Circle the correct answer. in a random sample of 22 families, the mean weekly food expense was $95.60 with a sample standard deviation of $22.50. Assume the weekly food expense is normally distributed. A) Normal distribution B) t-distribution C) Neither For a sample of 20 IQ scores...
The analysis of sales receipts at Jones Department Store shows the dollar value of sales are...
The analysis of sales receipts at Jones Department Store shows the dollar value of sales are normally distributed with a mean of $200 and a standard deviation of $30. A. Find the probability that the dollar value of sales will be between $180 and $205. B. Find the probability that the dollar value of sales will be less than $170. C. Jones Department Store wants to give a discount to shoppers who purchase a large dollar volume. What dollar volume...
Suppose the variable x is represented by a standard normal distribution. What value of x is...
Suppose the variable x is represented by a standard normal distribution. What value of x is at the 60th percentile of the distribution? Equivalently, what is the value for which there is a probability of 0.60 that x will be less than that value? Please round your answer to the nearest hundredth.
1. About % of the area under the curve of the standard normal distribution is outside...
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7. For a standard normal distribution, find: P(z < c) = 0.1164 Find c rounded to...
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61. The figure above shows the standard normal distribution, with mean 0 and standard deviation 1, including approximate percents of the distribution corresponding to the six regions shown. The random variable Y is normally distributed with a mean of 470, and the value Y = 340 is at the 15th percentile of the distribution. Of the following, which is the best estimate of the standard deviation of the distribution? A. 125 B. 135 C. 145 D. 155 E. 165
1. Use Table A to find the proportion of observations from a standard Normal distribution that satisfies each of the following statements. In each case, sketch a standard Normal curve and shade the area under the curve that is the answer to each question. a. z<-1.83 b.z > 2.18 c. Z>-0.51 d. z <0.33 e. 1.42<z <2.68 f.-2 <2<1.53 X is a normally distributed variable with mean u = 30 and standard deviation o = 4. Find the following: a....
7. Determine whether a normal distribution or a normal distribution or t distribution should be used or whether neither of should be used to construct a confidence interval for the mean. (Section 6.2) Circle the correct answer. in a random sample of 22 families, the mean weekly food expense was $95.60 with a sample standard deviation of $22.50. Assume the weekly food expense is normally distributed. A) Normal distribution B) t-distribution C) Neither For a sample of 20 IQ scores...
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