Math Homework

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8. The life span of a battery is normally distributed, with
8. The life span of a battery is normally distributed, with a mean of 2300 hours and a standard deviation of 50 hours. What percent of batteries have a life span that is more than 2365 hours? What per… read more
Ryan
Bachelor's Degree
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This is the last set for tonight ... thank you ! 15. As
This is the last set for tonight ... thank you ! 15. As the sample size increases (Points: 5) A)The confidence interval also increases (gets larger) B)The confidence interval decreases (gets smaller) … read more
Stevewh
Teacher
Bachelor's Degree
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The expected value of an unbiased estimator is equal to the
The expected value of an unbiased estimator is equal to the parameter whose value is being estimated. A) True B) False 2 All estimators are biased since sampling errors always exist to some extent. A)… read more
Jabi
Tutor
Master's Degree
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Statistics- Detail only needed on the H0, Ha questions. Tx
Question 1 Which of the following probability experiments would result in a discrete random variable? a. Observing the number of minutes required to walk a mile b. Observing the number of light bulbs … read more
dhouse1940
Retired
Master's Degree
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1. The standard deviation of all possible values is called
1. The standard deviation of all possible values is called the a. standard error of proportion b. standard error of the mean c. mean deviation d. central variation 2. The number of random samples (wit… read more
Stevewh
Teacher
Bachelor's Degree
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7-1 C1 For the normal distribution, the mean plus and minus
7-1 C1 For the normal distribution, the mean plus and minus 1.96 standard deviations will include about what percent of the observations? A. 50% B. 99.7% C. 95% D. 68% 7-2 C2 What is the area under th… read more
Osbert12
Master's Degree
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1. (TCO 6) In the standard normal distribution, the variance
1. (TCO 6) In the standard normal distribution, the variance is always (Points: 5) 0 1 2 none of these 2. (TCO 6) The area under a normal curve with mu = 15 and sigma = 2 is (Points: 5) 0 1 2 none of … read more
Scott
Master's Degree
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Two events are complementary when A) the sum of their probabilities
Two events are complementary when A) the sum of their probabilities is one. B) the joint probability of the two events is one. C) they are mutually exclusive. D) None of the above. 2. Are Service prov… read more
mhasan420
Bachelor's Degree
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I have 10 question and would like someone to check my answers
I have 10 question and would like someone to check my answers on 8. I need and answer on 1 and have a conflict on another. The subject is business statistics. 1. Which of the following statements are … read more
Jim C
Master's Degree
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1.A medical researcher treats 100 subjects with high cholesterol
1.A medical researcher treats 100 subjects with high cholesterol with a new drug. The average decrease in cholesterol level is x=80 after two months of taking the drug. Assume that the decrease in cho… read more
Jim C
Master's Degree
523 satisfied customers
1.In a normal distribution with mu 25 and sigma 9, what
1.In a normal distribution with mu = 25 and sigma = 9, what number corresponds to z = -2? 2.In the standard normal distribution, the variance is always 3.The area under a normal curve with mu = 8 and … read more
Scott
Master's Degree
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Suppose an actual census showed that 18.4% of the households
Suppose an actual census showed that 18.4% of the households in California have incomes in excess of \$50,000. The probability that the sample proportion will be 0.22 or greater for a random sample of … read more
David
Post-Doctoral Degree
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1. Assume x is normally distributed with mean and standard
1. Assume x is normally distributed with mean and standard deviation . Use the approximate areas beneath the normal curve, as discussed in this section, to answer the following questions. Find (Points… read more
muvee
Master's Degree
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2. An auditor for a large oil corporation has taken a random
2. An auditor for a large oil corporation has taken a random sample of monthly credit card charges for 32 individual (non-corporate) accounts. She found a mean of \$81.76. Assume that the population st… read more
Sk1llz
Math student
1,518 satisfied customers
In a given year, the average annual salary of a NFL football
In a given year, the average annual salary of a NFL football player was \$189,000 with a standard deviation of \$20,500. If a sample of 50 players was taken, then probability that the sample mean will b… read more
Greg
Master's Degree
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1. Explain the difference between a discrete and a continuous
1. Explain the difference between a discrete and a continuous random variable. Give two examples of each type of random variable. 2. Determine whether each of the distributions given below represents … read more
Greg
Master's Degree
1,292 satisfied customers
Given that z is a standard normal random variable and that
Given that z is a standard normal random variable and that the area to the right of z is 0.1949, then the value of z must be A) 0.51 B) -0.51 C) 0.86 D) -0.86 Consider an infinite population with a me… read more
peppers18
Bachelor's Degree
94 satisfied customers
7.8 If x is normally distributed with 20.0 and s 4.0,
7.8 If x is normally distributed with µ = 20.0 and s = 4.0, determine the following: a. P(x = 20.0) b. P(16.0 = x = 24.0) c. P(x = 12) d. P(x = 22.0) e. P(12.0 = x = 28.0) f. P(x = 16) 7.14 A study by… read more
abozer
Bachelor's Degree
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