A population of 29-year-old males has a mean salary of $28,975 with a standard deviation of...
A population of 29-year-old males has a mean salary of $28,975 with a standard deviation of $2,020. A sample of 100 29-year old males is taken. Assuming a normal distribution, what is the probability that their mean salaries will be less than $31,000?
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A population of 29-year-old males has a mean salary of $28,975
with a standard deviation of...
The upper leg length of 20- to 29-year-old males is Normally distributed with a population mean...
The upper leg length of 20- to
29-year-old males is Normally distributed with a population mean
length, , of 43.7 cm and a population standard deviation, , of 4.2
cm. Suppose we take a random sample of 100 20- to 29-year-old
males.
(a) (2 points) What value should we expect for the mean weight
of this sample of 100 males?
(2 points) What is the standard error
(3 points) Show that the CLT conditions for means are
satisfied. Be sure...
The heights of 20- to 29-year-old males in the United States are approximately normal, with mean...
The heights of 20- to 29-year-old males in the United States are
approximately normal, with mean 70.4 in. and standard deviation 3.0
in.
Round your answers to 2 decimal places.
a. If you select a U.S. male between ages 20
and 29 at random, what is the approximate probability that he is
less than 69 in. tall?
The probability is about_______ %.
b. There are roughly 19 million 20- to
29-year-old males in the United States. About how many are...
5.4.1 Question Help A population has a mean = 141 and a standard deviation o =...
5.4.1 Question Help A population has a mean = 141 and a standard deviation o = 28. Find the mean and standard deviation of the sampling distribution of sample means with sample size n = 40. The mean is :-), and the standard deviation is 0;=0 (Round to three decimal places as needed.) 5.4.2 Question Help A population has a meanu - 74 and a standard deviation = 8. Find the mean and standard deviation of a sampling distribution of...
Questions 23-30: A normal population has a mean μ = 50 and a standard deviation σ...
Questions 23-30: A normal population has a mean μ = 50 and a standard deviation σ = 8. That is, ?~?(50,8). Circle your final answer for each question below. 23. What is the z-score for an individual with a value of 38? 24. What is the probability that a randomly chosen individual from this population will be greater than 40? 25. What is the probability that a randomly chosen individual from this population will be between 44 and 60? 26....
A population has a mean of 200 and a standard deviation of 50. A sample of...
A population has a mean of 200 and a standard deviation of 50. A sample of size 100 will be taken and the sample mean will be used to estimate the a. What is the expected value of x? b. What is the standard deviation of x? c. 18. population mean Show the sampling distribution of x What does the sampling distribution of i show?
A sample of size 29 will be drawn from a population with mean 108 and standard...
A sample of size 29 will be drawn from a population with mean 108 and standard deviation 32. (a) Is it appropriate to use the normal distribution to find probabilities for x? (b) If appropriate find the probability that x will be less than 88. (c) If appropriate find the 80th percentile of x. .
A variable of a population has a mean of 100 and a standard deviation of 28....
A variable of a population has a mean of 100 and a standard deviation of 28. Consider the sample distribution of samples means of sample size 49. a. What is the mean of sample means? b. What is the standard deviation of the sample means? c. Is the distribution of sample means normal? Why or why not? Do we need to know if the variable in question is normally distributed in the population? Why or why not?
A normal population has mean u=61 and standard deviation o=17. (a) What proportion of the population...
A normal population has mean u=61 and standard deviation o=17. (a) What proportion of the population is greater than 100? (b) What is the probability that a randomly chosen value will be less than 82? Round the answers to four decimal places. Part 1 of 2 The proportion of the population greater than 100 is Part 2 of 2 The probability that a randomly chosen value will be less than 82 is
The average teacher’s salary in Connecticut (ranked first among states) is $58,698. Suppose that the distribution...
The average teacher’s salary in Connecticut (ranked first among states) is $58,698. Suppose that the distribution of salaries is normal with a standard deviation of $7,500 a. What is the probability that a randomly selected teacher makes less than $52,000 per year? b. If we sample 100 teachers’ salaries, what is the probability that the sample mean is less than $56,000?
1. A population has a mean of 60 and a standard deviation of 30. Samples of...
1. A population has a mean of 60 and a standard deviation of 30. Samples of size 16 are randomly selected. Calculate the standard deviation of the sample distribution X. 2. Samples of size 16 are drawn from a population. the sampling distribution for X has a standard deviation of 0.25. Find the standard deviation of the population. 4. Tires are found to have a mean life of 40,000 miles. The standard deviation is 8000. A sample of 400 is...
The upper leg length of 20- to
29-year-old males is Normally distributed with a population mean
length, , of 43.7 cm and a population standard deviation, , of 4.2
cm. Suppose we take a random sample of 100 20- to 29-year-old
males.
(a) (2 points) What value should we expect for the mean weight
of this sample of 100 males?
(2 points) What is the standard error
(3 points) Show that the CLT conditions for means are
satisfied. Be sure...
The heights of 20- to 29-year-old males in the United States are
approximately normal, with mean 70.4 in. and standard deviation 3.0
in.
Round your answers to 2 decimal places.
a. If you select a U.S. male between ages 20
and 29 at random, what is the approximate probability that he is
less than 69 in. tall?
The probability is about_______ %.
b. There are roughly 19 million 20- to
29-year-old males in the United States. About how many are...
5.4.1 Question Help A population has a mean = 141 and a standard deviation o = 28. Find the mean and standard deviation of the sampling distribution of sample means with sample size n = 40. The mean is :-), and the standard deviation is 0;=0 (Round to three decimal places as needed.) 5.4.2 Question Help A population has a meanu - 74 and a standard deviation = 8. Find the mean and standard deviation of a sampling distribution of...
A population has a mean of 200 and a standard deviation of 50. A sample of size 100 will be taken and the sample mean will be used to estimate the a. What is the expected value of x? b. What is the standard deviation of x? c. 18. population mean Show the sampling distribution of x What does the sampling distribution of i show?
A normal population has mean u=61 and standard deviation o=17. (a) What proportion of the population is greater than 100? (b) What is the probability that a randomly chosen value will be less than 82? Round the answers to four decimal places. Part 1 of 2 The proportion of the population greater than 100 is Part 2 of 2 The probability that a randomly chosen value will be less than 82 is
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