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15. A weighted average is A. the balance between the sample size and the mean B....
A sample size of 120 had a sample mean and standard deviation of 100 and 15 respectively. Of thes...
A sample size of 120 had a sample mean and standard deviation of 100 and 15 respectively. Of these 120 data values, 3 were less than 70, 18 were between 70 and 85, 30 between 85 and 100, 35 between 100 and 115, 32 were between 115 and 130 and 2 were greater than 130. Test the hypothesis that the sample distribution was normal.
What is the t-value for a 90% confidence interval for the mean if the sample size...
What is the t-value for a 90% confidence interval for the mean if the sample size is 24? a. 1.984 b. 1.714 c. 2.069 d. 1.96 e. 2.306 In general, when choosing the sample size for estimating a mean, which of the following will result in a smaller margin of error (E)? a. a larger confidence level b. a smaller sample size c. a dozen glazed donuts d. a larger sample size e. a more expensive calculator
Historically, the daily average temperature in Waterloo in November has been 2.3 degrees, with a standard...
Historically, the daily average temperature in Waterloo in November has been 2.3 degrees, with a standard deviation of 5 degrees. Assuming daily average temperatures are normally distributed what is the probability that the daily average temperature on Nov 15 will be 5 degrees or more? Question 7 options: 0.4631 0.7054 0.025 0.2946 Question 8 (1 point) Historically, the daily average temperature in Waterloo in November has been 2.3 degrees, with a standard deviation of 5 degrees. Assuming daily average temperatures...
To test the effectiveness of a treatment, a sample of n = 36 people is selected...
To test the effectiveness of a treatment, a sample of n = 36 people is selected from a normal population with mean of μ = 60. After the treatment is administered to the individuals in the sample, the sample mean is found to be M = 55. (a) If the population standard deviation is σ = 13, can you conclude that the treatment has a significant effect? Use a two-tailed test with α = 0.05. (Round your answers to two...
A sample of size 45 will be drawn from a population with mean 10 and standard...
A
sample of size 45 will be drawn from a population with mean 10 and
standard deviation 5. Find the probability that x will be greater
than 11.
32) A sample of size 45 will be drawn from a population with mean 10 and standard deviation 5. Find the probability that x will be greater than 11. B) 0.9099 A) 0.0901 C) 0.0721 D) 0.1170
Sample A has a larger standard error of the mean than Sample B. Which sample mean...
Sample A has a larger standard error of the mean than Sample B. Which sample mean would you trust to be a better estimate of the population mean? a. both samples would provide equally good estimates of the population mean b. unable to determine with the provided information c. Sample A d. Sample B
5.32 Average file size on a tablet. Suppose that the true mean file size of the...
5.32 Average file size on a tablet. Suppose that the true mean file size of the music and video files on the tablet is 2.35 MB and you plan to take an SRS of n=50, the standard deviation of the population is 3.25 MB. a.) explain why it may be reasonable to assume that the average mean is approximately Normal even though the population distribution is highly skewed? b.) sketch the approximate normal curve for the sample mean, making sure...
3) Suppose you know the population mean and are interested in seeing how a sample average...
3) Suppose you know the population mean and are interested in seeing how a sample average compares to this mean. You take some samples of size 10 and other samples of size 35. How will the sampling distribution of the means be different for the larger size samples compared to the sampling distribution of the means for the smaller size samples? (Note: This is a multiple-choice question - write the letter of the correct answer.) (1 point) A. The sampling...
Select the statement that best describes the relationship between an actual average sample mean versus theoretical...
Select the statement that best describes the relationship between an actual average sample mean versus theoretical average sample mean. 1. The actual average sample mean will almost never be exactly equal to the theoretical average sample mean, because random samples are, as their name implies, random. Over the course of many samples, the average sample mean will not approach the theoretical value. 2. The actual average sample mean will almost never be exactly equal to the theoretical average sample mean,...
6. Each of the following statements are true, except that A) increasing the sample size will...
6. Each of the following statements are true, except that A) increasing the sample size will decrease standard error B) the larger the sample size, the larger the standard error x C) the larger the standard deviation in the population, the larger the standard error D) both A and C E) both B and C
A
sample of size 45 will be drawn from a population with mean 10 and
standard deviation 5. Find the probability that x will be greater
than 11.
32) A sample of size 45 will be drawn from a population with mean 10 and standard deviation 5. Find the probability that x will be greater than 11. B) 0.9099 A) 0.0901 C) 0.0721 D) 0.1170
3) Suppose you know the population mean and are interested in seeing how a sample average compares to this mean. You take some samples of size 10 and other samples of size 35. How will the sampling distribution of the means be different for the larger size samples compared to the sampling distribution of the means for the smaller size samples? (Note: This is a multiple-choice question - write the letter of the correct answer.) (1 point) A. The sampling...
6. Each of the following statements are true, except that A) increasing the sample size will decrease standard error B) the larger the sample size, the larger the standard error x C) the larger the standard deviation in the population, the larger the standard error D) both A and C E) both B and C
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