A sample of size 49 is randomly selected from a population with a mean, 25 and standard deviation, 14. Find P(X-bar > 26)
| a | .8413 |
| b | .3085 |
| c | .1357 |
| d | .5279 |
A sample of size 49 is randomly selected from a population with a mean, 25 and...
A sample of size n=20 is randomly selected from a normal population with mean μ = 90 and standard deviation σ = 5. Find the following: a) P(̅X>95) b) P(82<̅X<91) c) P(̅X<93) d) P(̅X<89)
A sample of size n = 49 is selected from a population with mean E(X) = 58 and standard deviation SD(X) = 22. The expected value E(x) and standard deviation SD(x) of the sampling distribution of the sample mean x are:_______________ A) 58 and 0.67 respectively B) 58 and 22, respectively C) 58 and 9.88 respectively D) 58 and 3.14, respectively E) 58 and 0.45 respectively
4.18 A random sample of size 25 is selected from a population with mean μ = 85 and standard deviation σ-4. Approximate the following probabilities using the central limit theorem (a) PrX 86, 6451 (b) PrX < 84.340] (c) Pr(83.04 〈 X < 86.96]
Suppose a random sample of 49 measurements is selected from a population with a mean of 44 and a standard deviation of 1.1. What is the mean and standard error of X?
1) A sample of size 25 is chosen from a population. Assume the probability distribution is normal. If the mean of the sample is 80 and the standard deviation is 6, find the lower bound of the 99% confidence interval. Round off to three decimal places. 2) A sample of size 36 is chosen from a population. The sample mean is 50 and the standard deviation is 5. Find the upper limit of the 95% confidence interval for the population...
A sample of size n = 36 is selected from a population with mean E(X) = 52 and standard deviation SD(X) = 26. The expected value E(x) and standard deviation SD(x) of the sampling distribution of the sample mean x are: 52 and 4.33, respectively 52 and 18.78 respectively 52 and 26, respectively 52 and 0.85 respectively 52 and 0.72 respectively
A random sample of n=49 observations is drawn from a population with a mean equal to 51 and a standard deviation equal to 14. c. Find the probability that x over bar x falls between 45 and 53. c. The probability that x over bar x falls between 45 and 53 is _____(Round to three decimal places as needed.) The answer.976 in not correct.
A simple random sample of size n 49 is obtained from a population with u 75 and o 14 (a) Describe the sampling distribution of x. (b) What is P (x>77.2)? (c) What is P (xs 71)? (d) What is P (73.8 < x<80)? (a) Choose the correct description of the shape of the sampling distribution of x. O A. The distribution is skewed right. B. The distribution is approximately normal. OC. The distribution is skewed left O D. The...
A random sample of =49 observations is drawn from a population with a mean equal to 15 and a standard deviation equal to 14. a. Give the mean and standard deviation of the (repeated) sampling distribution x overbarx. b. Describe the shape of the sampling distribution of x overbarx. Does your answer depend on the sample size? c. Calculate the standard normal z-score corresponding to a value of x overbarxequals=12.5. d. Calculate the standard normal z-score corresponding to a value...
A random sample of=49 observations is drawn from a population with a mean equal to 20 and a standard deviation equal to14. a. Find the probability that x overbarx is less than 14. b. Find the probability that x overbarx is greater than 25. c. Find the probability that x overbarx falls between 14 and 22 a. The probability that x overbarx is less than 14 is _________(Round to three decimal places as needed.)