suppose there is a normally distributed population with a mean of 250 and a standard deviation...
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suppose there is a normally distributed population with a mean of
250 and a standard deviation...
Suppose that a population is known to be normally distributed with mean= 2,100 and standard deviation=...
Suppose that a population is known to be normally distributed with mean= 2,100 and standard deviation= 210. If a random sample of size n=8 is selected, calculate the probability that the sample mean will exceed 2,200.
20.Suppose x is normally distributed with mean 2,825 and standard deviation 250. Find P(2,700 ≤ x...
20.Suppose x is normally distributed with mean 2,825 and standard deviation 250. Find P(2,700 ≤ x ≤ 3,200).
A population is normally distributed with a mean of 61 and a standard deviation of 18....
A population is normally distributed with a mean of 61 and a standard deviation of 18. (a) What is the mean of the sampling distribution (μM) for this population? μM = (b) If a sample of 36 participants is selected from this population, what is the standard error of the mean (σM)? σM = (c) Sketch the shape of this distribution with M ± 3 SEM.
Suppose that pizza delivery times are normally distributed with a population standard deviation of 6 minutes....
Suppose that pizza delivery times are normally distributed with a population standard deviation of 6 minutes. A random sample of 50 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Construct a 90% confidence interval for the population mean delivery time. What is the sample mean? 6 1.87 36 1.64 What is the sample size? 8.33 90 50 36 What is the population standard deviation? 0.85 50 36 6 What is the confidence level?...
Suppose the population standard deviation is believed to be $812 and the salaries are normally distributed....
Suppose the population standard deviation is believed to be $812 and the salaries are normally distributed. Find the sample size needed to construct a 98% confidence interval to estimate the average salary of accountants, within +/- $200.
A normally distributed population has a mean of 500 and a standard deviation of 80. a....
A normally distributed population has a mean of 500 and a standard deviation of 80. a. Determine the probability that a random sample of size 25 selected from this population will have a sample mean less than 463 . b. Determine the probability that a random sample of size 16 selected from the population will have a sample mean greater than or equal to 538. A company makes windows for use in homes and commercial buildings. The standards for glass...
If the standard deviation of a normally distributed population is 60 and we take a sample...
If the standard deviation of a normally distributed population is 60 and we take a sample of size 25, then what is the (standard error) standard deviation of the sampling distribution of sample means. * Your answer If the mean of a population is 3 points 250 and we take a sample of size 25, then what is the mean of the sampling distribution of sample means. * Your answer 3 points A certain car model has a mean gas...
A normally distributed population has a mean of 475 and a standard deviation of 48. a....
A normally distributed population has a mean of 475 and a standard deviation of 48. a. Determine the probability that a random sample of size 9 selected from this population will have a sample mean less than 451. b. Determine the probability that a random sample of size 16 selected from the population will have a sample mean greater than or equal to 498. a. P(X<451) = (Round to four decimal places as needed.) b. P(X2498) = 1 (Round to...
Suppose that for some hypothesis test on the mean of a normally distributed population, standard deviation known, the P...
Suppose that for some hypothesis test on the mean of a normally distributed population, standard deviation known, the P- value is computed as 0.11. If a level of significance of 0.05 is used, is rejecting the null hypothesis in favor of the alternative the correct decision? Yes No
A normally distributed population has a mean of µ = 70 and a standard deviation of...
A normally distributed population has a mean of µ = 70 and a standard deviation of σ = 12. A sample (n = 36) is selected from a population and a treatment is administered to the sample. After treatment, the sample mean is found to be M = 65. Does this sample provide evidence of a statistically significant treatment effect with an alpha of 0.05 (non-directional hypothesis)? [G&W Chp 8] Yes, our z-score reaches the critical region. No, our z-score fails to...
If the standard deviation of a normally distributed population is 60 and we take a sample of size 25, then what is the (standard error) standard deviation of the sampling distribution of sample means. * Your answer If the mean of a population is 3 points 250 and we take a sample of size 25, then what is the mean of the sampling distribution of sample means. * Your answer 3 points A certain car model has a mean gas...
A normally distributed population has a mean of 475 and a standard deviation of 48. a. Determine the probability that a random sample of size 9 selected from this population will have a sample mean less than 451. b. Determine the probability that a random sample of size 16 selected from the population will have a sample mean greater than or equal to 498. a. P(X<451) = (Round to four decimal places as needed.) b. P(X2498) = 1 (Round to...
Suppose that for some hypothesis test on the mean of a normally distributed population, standard deviation known, the P- value is computed as 0.11. If a level of significance of 0.05 is used, is rejecting the null hypothesis in favor of the alternative the correct decision? Yes No
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