Homework Answers
A normal curve will be drawn within three standard deviations of the mean. Only option b shows a normal curve within three standard deviations of the mean. Thus, the correct answer is option b.
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Below is a distribution with mean u = -38 and o = 2. Which of the...
Describe the standard normal distribution. What are its characteristics? Choose the correct answer below. O A....
Describe the standard normal distribution. What are its characteristics? Choose the correct answer below. O A. The standard normal distribution is a normal probability distribution with mean u = 0 and standard deviation o = 1. Similar to any normal probability distribution, it has associated with it a bell-shaped curve, symmetric about a vertical line through u with inflection points at o and -o. The Z-scores theorem, along with a table of areas under this standard normal curve can be...
U.2.1 According to a study of political prisoners, the mean duration of imprisonment for 38 prisoners...
U.2.1 According to a study of political prisoners, the mean duration of imprisonment for 38 prisoners with chronic post-traumatic stress disorder (PTSD) was 32 3 months. Assuming that = 39 months, determine a 95% confidence interval for the mean duration of imprisonment of all political prisoners with chronic PTSD. Interpret your answer in words. Click here to view Page 1 of the table of areas under the standard normal curve Click here to view Page 2 of the table of...
Assume the random variable X is normally distributed with mean equal to 50 and standard deviation...
Assume the random variable X is normally distributed with mean
equal to 50 and standard deviation of 7. Compute the probability.
Be sure to draw a normal curve with the area corresponding to the
probability shaded. P(35<x<58)
Assume the random variable X is normally distributed with mean u = 50 and standard deviation o= 7. Compute the probability. Be sure to draw a normal curve with the area corresponding to the probability shaded. P(35<X<58) Click the icon to view a...
= 50 and standard deviation o = 7. Compute the probability. Be sure to draw a...
= 50 and standard deviation o = 7. Compute the probability. Be sure to draw a normal curve with Assume the random variable X is normally distributed with mean the area corresponding to the probability shaded. PIX> 36) Click the icon to view a table of areas under the normal curve. Which of the following normal curves corresponds to P(X> 36)? OA OB 36 50 36 50 36 50 PIX>36) = 0.6406 (Round to four decimal places as needed.)
Find the indicated probability by using the special addition rule. 36) The age distribution of students...
Find the indicated probability by using the special addition rule. 36) The age distribution of students at a community college is given below 36) Under 21 21-25 26-30 31-35 Over 35 401 420 216 58 24 1119 student from the community college is selected at random. Find the probabity that the student A) 0.052 is between 26 and 35 inclusive. Round approximations to three decimal places B) 0.193 C) 274 D) 0.245 37) A relative frequency distribution is given below...
Suppose X is a normal random variable with mean u = 50 and standard deviation o...
Suppose X is a normal random variable with mean u = 50 and standard deviation o = 11. (a) Compute the z-value corresponding to X = 36. (b) Suppose the area under the standard normal curve to the left of the Z-value found in part (a) is 0.1016. What is the area under the normal curve to the left of X = 36? (c) What is the area under the normal curve to the right of X = 36? (a)...
astering Assume the random variable X is normally distributed with mean u 50 and standard deviation...
astering Assume the random variable X is normally distributed with mean u 50 and standard deviation a 7. Compute the probability. вгагy P(52 sXs60) udent Services Click the icon to view a table of areas under the normal curve. labus Which of the following normal curves corresponds to P(52 sXs66)? utoring arch 5052 66 5052 66 P(62 sXs66)-(Round to four decimal places as needad.)
A sample from a Normal distribution with an unknown mean u and known variance o =...
A sample from a Normal distribution with an unknown mean u and known variance o = 45 was taken with n=9 samples giving sample mean of y = 3.6. (a) Construct a Hypothesis test with significance level a = 0.05 to test whether the mean is equal to 0 or it is greater than 0. What can you conclude based on the outcome of the sample? (b) Calculate the power of this test if the true value of the mean...
A random variable is normally distributed with a mean of u = 90 and a standard...
A random variable is normally distributed with a mean of u = 90 and a standard deviation of o = 10. (a) The following figure shows that the normal curve almost touches the horizontal axis at three standard deviations below and at three standard deviations above the mean (in this case at 60 and 120). Areas Under the Curve for any Normal Distribution 99.7% 95.4% + 68.3% – pi - 30 -lo u u + lo u + 30 A...
Below is a graph of a normal distribution with mean -4 and standard deviation o 3....
Below is a graph of a normal distribution with mean -4 and standard deviation o 3. The shaded region represents the probability of obtaining a value from this distribution that is less than 5.5. 0.4 0.3 0.2 0.1- - 5.5 -4 Shade the corresponding region under the standard normal density curve below 0.4 ? 0.3 0.2 0.1
Describe the standard normal distribution. What are its characteristics? Choose the correct answer below. O A. The standard normal distribution is a normal probability distribution with mean u = 0 and standard deviation o = 1. Similar to any normal probability distribution, it has associated with it a bell-shaped curve, symmetric about a vertical line through u with inflection points at o and -o. The Z-scores theorem, along with a table of areas under this standard normal curve can be...
U.2.1 According to a study of political prisoners, the mean duration of imprisonment for 38 prisoners with chronic post-traumatic stress disorder (PTSD) was 32 3 months. Assuming that = 39 months, determine a 95% confidence interval for the mean duration of imprisonment of all political prisoners with chronic PTSD. Interpret your answer in words. Click here to view Page 1 of the table of areas under the standard normal curve Click here to view Page 2 of the table of...
Assume the random variable X is normally distributed with mean
equal to 50 and standard deviation of 7. Compute the probability.
Be sure to draw a normal curve with the area corresponding to the
probability shaded. P(35<x<58)
Assume the random variable X is normally distributed with mean u = 50 and standard deviation o= 7. Compute the probability. Be sure to draw a normal curve with the area corresponding to the probability shaded. P(35<X<58) Click the icon to view a...
= 50 and standard deviation o = 7. Compute the probability. Be sure to draw a normal curve with Assume the random variable X is normally distributed with mean the area corresponding to the probability shaded. PIX> 36) Click the icon to view a table of areas under the normal curve. Which of the following normal curves corresponds to P(X> 36)? OA OB 36 50 36 50 36 50 PIX>36) = 0.6406 (Round to four decimal places as needed.)
Find the indicated probability by using the special addition rule. 36) The age distribution of students at a community college is given below 36) Under 21 21-25 26-30 31-35 Over 35 401 420 216 58 24 1119 student from the community college is selected at random. Find the probabity that the student A) 0.052 is between 26 and 35 inclusive. Round approximations to three decimal places B) 0.193 C) 274 D) 0.245 37) A relative frequency distribution is given below...
Suppose X is a normal random variable with mean u = 50 and standard deviation o = 11. (a) Compute the z-value corresponding to X = 36. (b) Suppose the area under the standard normal curve to the left of the Z-value found in part (a) is 0.1016. What is the area under the normal curve to the left of X = 36? (c) What is the area under the normal curve to the right of X = 36? (a)...
astering Assume the random variable X is normally distributed with mean u 50 and standard deviation a 7. Compute the probability. вгагy P(52 sXs60) udent Services Click the icon to view a table of areas under the normal curve. labus Which of the following normal curves corresponds to P(52 sXs66)? utoring arch 5052 66 5052 66 P(62 sXs66)-(Round to four decimal places as needad.)
A sample from a Normal distribution with an unknown mean u and known variance o = 45 was taken with n=9 samples giving sample mean of y = 3.6. (a) Construct a Hypothesis test with significance level a = 0.05 to test whether the mean is equal to 0 or it is greater than 0. What can you conclude based on the outcome of the sample? (b) Calculate the power of this test if the true value of the mean...
A random variable is normally distributed with a mean of u = 90 and a standard deviation of o = 10. (a) The following figure shows that the normal curve almost touches the horizontal axis at three standard deviations below and at three standard deviations above the mean (in this case at 60 and 120). Areas Under the Curve for any Normal Distribution 99.7% 95.4% + 68.3% – pi - 30 -lo u u + lo u + 30 A...
Below is a graph of a normal distribution with mean -4 and standard deviation o 3. The shaded region represents the probability of obtaining a value from this distribution that is less than 5.5. 0.4 0.3 0.2 0.1- - 5.5 -4 Shade the corresponding region under the standard normal density curve below 0.4 ? 0.3 0.2 0.1
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