For a population with o= 15, how large a sample would be needed to have a standard error of 3 points or less?

Q: For a two-tailed test at 99% confidence based on a sample of size 20 with unknown population…

A: Confidence interval is a range of values it contains the true population parameter with specified…

Q: A population has a mean of u = 65 and a standard deviation of o = 15. If you select a random sample…

A: From the provided information, Mean (µ) = 65 Standard deviation (σ) = 15 X~N (65, 15)

Q: For a particular population, a sample of n = 4 scores has a standard error of 6. For the same…

A: Given data,If n=4 then σx =6 If n=16 σx=?

Q: At 95% confidence, how large a sample should be taken to obtain a margin of error of .03 for the…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Use EXCEL…

Q: For a population with μ = 80, and σ = 20, the distribution of sample means based on a sample size of…

A: The expected value for the mean of .

Q: A sample with a mean of M = 40 and a variance of s2 = 12 has an estimated standard error of 2…

A:

Q: Samples of size n = 9 are selected from a population with u = 80 with o= 18. What is the standard…

A: The formula of standard error of the mean is,

Q: For a population with σ = 12, how large a sample is necessary to have a standard error that is:…

A: 1. E≤4 2. E≤3 3. E≤2

Q: For a two-tailed test at 99% confidence based on a sample of size 20 with unknown population…

A: In hypothesis testing, a critical value is a point on the test distribution which is compared with…

Q: Here sample 10 people in a high school to try to predict GPA in 10th grade from GPA in 9th grade.…

A: It is given that the SSE =5.8, sample size (n) is 10 and the regressor is GPA. Therefore, the…

Q: In the statistical inference of two samples, the margin of error is obtained by O a. multiplying the…

A: In statistical inference of two samples ,the margin of error is obtained by multiplying the standard…

Q: A sample of n = 16 scores has a mean of M = 58 with SS = 960. Use the sample to construct the 90%…

A: Given  N = 16 M = 58  SS = 960  C1 = 90 For SS we will solve S2 = 64 df = n-1 = 16-1 =15

Q: A sample with a mean of M = 40 and a variance of s2 = 20 has an estimated standard error of 1 point.…

A: Mean = 40 Variance = 20 Standard error = 1

Q: For a population with σ = 12, how large a sample is necessary to have a standard error that is less…

A:

Q: A sample of n = 4 scores has a standard error of 10 points. For the same population, what is the…

A:

Q: A sample of n = 49 scores with M = 43 is selected from a population with µ = 40 with σ = 21. What is…

A: Mean = 40 Standard deviation = 21 Sample size = 49 Sample mean = 43

Q: For a two-tailed test at 99% confidence based on a sample of size 20 with unknown population…

A: For 99% confidence level we have to find the critical value.

Q: The standard deviation of the diameter of 18 baseballs was found to be o.29 cm. Find the 95%…

A: Given: Sample size (n) = 18 Sample standard deviation (s) = 0.29 Confidence level = 0.95 So,…

Q: Find the sample size needed for a confidence interval about the population proportion if you want a…

A:

Q: A sample of n = 100 scores is selected from a population with u = 100 with o = 30. On average, how…

A: The formula of the standard error of the mean is,

Q: A local restaurant claims that it gets 45 percent of its customers from Monday through Thursday, 20…

A: Given Information:  A local restaurant claims that it gets 45 percent of its customers from Monday…

Q: Given that the population standard deviation is o = 1, determine the minimum sample size needed in…

A:

Q: A sample of n= 4 scores has a variance of s 64. What is the estimated standard error for the sample…

A: Givensample size(n)=4variance(s2)=64

Q: In sampling without replacement from a population of 900, it's found that the standard error of the…

A: Given N=900

Q: to take a simple random sample of size n from the production line. If he were to double his sample…

A: Chocolate bars produced by a certain machine are labeled 8.0 ounces. The distribution of the actual…

Q: Samples of size n=9 are selected from a population with u = 80 with ở = 18. What is the standard…

A: The standard error for the distribution of the sample means.

Q: A sample of n = 25 scores is selected from a population with mu = 80 with sigma ^ 2 = 20 On average,…

A: Given information- Population mean, µ = 80 Population standard deviation, σ = 20 Sample size, n = 25…

Q: Use The t Distribution Table to find the t/α2 value for a 98% confidence interval for the mean when…

A: Given that n = 17 Degrees of freedom = df = n - 1 = 17 - 1 = 16 t/α2 value for a 98% confidence…

Q: Find the critical value, t c,  used for a 90% confidence interval for the mean with a sample size of…

A: The confidence level is, 100 (1 – α) % = 90%. Hence, (1 – α) = 0.90, and the significance level is,…

Q: A sample with a mean of M= 40 and a variance of s2 = 20 has an estimated standard error of 1 point.…

A: Given that, M = 40s2=20SE=1 The value of standard deviation is, s=s2 =20 =4.472136 The formula of…

Q: For a population with σ = 10, how large a sample is necessary to have a standard error that is: Less…

A: The standard deviation of the population is σ=10.

Q: A statistical research yields to the sample proportion of a certain feature in a certain community…

A:

Q: For a population with o = 24, how large a sample is necessary to have a standard error that is: %3D…

A:

Q: Find the value of ta/2 and n = 25 for the 90% confidence interval for the mean if the population…

A:

Q: 3. For a population with µ = 80 and o = 20, the distribution of sample means based onn = 16 will…

A:

Q: A random sample of size 35, taken from a normal population with a variance of 5, has a mean of 80. A…

A:

Q: How large a sample would have to be drawn to make these limits differ by only 0·1 gm,  assuming that…

A: The objective is to find the sample size required so that the limits differ by only 0·1 gm,…

Q: A sumple from a normal population with mu = 50 and sigma = 6 of M=48.20, . the sample…

A: Given Information: Population mean μ=50 Population standard deviation σ=6 Sample mean (M) = 48.20…

Q: If the standard error of the mean for the sampling distribution of random samples of size 25 from a…

A: Given:

Q: The distribution of life spans is approximately normal and u=40, how large a sample is required in…

A:

Q: A sample of n = 25 scores is selected from a normal population with a mean of u 80. However, the…

A:

Q: For a population with o = 12, how large a sample is necessary to have a standard error that is less…

A:

Q: Suppose x has a mound-shaped distribution witho = 3. Find the minimal sample size required so that…

A:

Q: (a) According to this information, the mean weight loss of people on this drug, u, could be as low…

A: Given: x¯=23Margin of error, E=2C=95%

Q: A sample obtained from a population with σ = 48 has a standard error of σM = 6. How many scores are…

A: Given that, Standard deviation = 48 Standard error = 6

Q: A simple random sample of size n=51 is taken from a normally distributed original population. The…

A: (1-α)% CI for σ is(n-1)s2χ2α/2,n-1≤σ≤(n-1)s2χ21-α/2,n-1

Q: For a particular population, a sample of n = 4 scores has a standard error of 6. For the same…

A: For a population, sample size is 4 and standard error is 6.