In a study using 16 samples and no indication of a normal distribution, the distribution that...
In a study using 16 samples and no indication of a normal distribution, the distribution that should be used to calculate confidence intervals is
a. a t distribution with 16 degrees of freedom
b. a t distribution with 17 degrees of freedom
c. a t distribution with 15 degrees of freedom
d. a normal distribution
Homework Answers
solution:
n =16
Degrees of freedom = df = n - 1 =16 - 1 = 15
c. a t distribution with 15 degrees of freedom
Add Answer to:
In a study using 16 samples and no indication of a normal
distribution, the distribution that...
Suppose a random sample of 17 is selected from a normal distribution and the sample mean...
Suppose a random sample of 17 is selected from a normal distribution and the sample mean x-bar = 102.5 and the sample standard deviation Sx = 4.3. Is this a z distribution or a t distribution? A. t distribution with 17 degrees of freedom B. t distribution with 16 degrees of freedom C. z distribution D. Cannot be determined Part b construct a 96% confidence interval for the population mean A. 100.17 to 104.83 B. 100.36 to 104.64 C. 100.00...
12. As the number of degrees ot trdom ort d n s the the t distribution...
12. As the number of degrees ot trdom ort d n s the the t distribution andd the standard nomal dist becomes larger b becomes smalter stays the same huctuates. d. 13. In interval esionation, thet distribution is applicatle ondy when a. the population has a mean of tess than 30 b. the sample standard deviation is used to estimate the population standard deviation the variance of the population is known d. the mean of the population is unknown. C....
Chapter 6, Section 4-D, Exercise 184 Use a t-distribution to answer this question. Assume the samples...
Chapter 6, Section 4-D, Exercise 184 Use a t-distribution to answer this question. Assume the samples are random samples from distributions that are reasonably normally distributed, and that a t-statistic will be used for inference about the difference in sample means. State the degrees of freedom used. Find the endpoints of the-distribution with 2.5% beyond them in each tail if the samples have sizes ni-17 and n2-27. Enter the exact answer for the degrees of freedom and round your answer...
7)The value for χ right for a 95% confidence interval when n-15 is 26.1 19. 7)...
7)The value for χ right for a 95% confidence interval when n-15 is 26.1 19. 7) A) False B) True 8) A study of nickels showed that the the standard deviation of the weight of nickels is 150 8) milligrams. A coin counter manufacturer wishes to find the 90% confidence interval for the average weight of a nickel. How many nickels does he need to weigh to obtain an average accurate to within 25 milligrams? A) 99 B) 139 36...
5. We wish to conduct a hypothesis test of the form Ho : μ1-2-0 vs Ha...
5. We wish to conduct a hypothesis test of the form Ho : μ1-2-0 vs Ha : μί-μ2 > 0. Both populations are assumed normal with equal variance and samples are assumed independent. We draw 15 observations for the first sample and 17 observations for the second sample. State the distribution of the test statistic for this test. (a) t-distribution with 32 degrees of freedom (b) t-distribution with 30 degrees of freedom (e) Normal distribution with 30 degrees of freedom...
8. Two independent random samples drawn from normal distributions have equal variances and means pli and...
8. Two independent random samples drawn from normal distributions have equal variances and means pli and M2. You are given • The sample mean from the first sample is 16.9. • The sample mean from the second sample is 22.1. • The number of observations from both samples combined is 17. • The upper bound of the 90% confidence interval for H1 - H2 is 1.44. Let tay be the critical value of a t random variable with v degrees...
8. Two independent random samples drawn from normal distributions have equal variances and means and p2....
8. Two independent random samples drawn from normal distributions have equal variances and means and p2. You are given The sample mean from the first sample is 16.9 The sample mean from the second sample is 22.1 The number of observations from both samples combined is 17 The upper bound of the 90% confidence interval for -2 is 1.44 Let tbe the critical value of a t random variable with v degrees of freedom. The foll owing table lists values...
4 pts Question 20 Consider taking random samples of size 50 from Population A with mean...
4 pts Question 20 Consider taking random samples of size 50 from Population A with mean 15 and standard deviation 3 and random samples of size 75 from Population B with mean 10 and standard deviation 5. Use the provided formula sheet to calculate the standard error of the distribution of differences in sample means, T-58 Standard error = (Select) How many degrees of freedom should be used when conducting inference for ид - ив with samples of this size?...
Question 15 This distribution is used for confidence intervals with large samples. χ² Z T F Question 16 You can reject a null hypothesis at the .01 alpha level and fail to...
Question 15 This distribution is used for confidence intervals with large samples. χ² Z T F Question 16 You can reject a null hypothesis at the .01 alpha level and fail to reject it at the .05 alpha level. True False Question 17 When nominal data are categorized, no overlapping can occur. We refer to these categories as being what? fill in the blank Question 18 Explain the difference between interval and ratio level data in your own words. Provide...
. Let W and V be independent random variables where W has a normal distribution with...
. Let W and V be independent random variables where W has a normal distribution with mean equal to Q and variance equal to , and V has açhi-square distribution with r degrees of freedom. V7 then what is the distribution of T A. t-distribution with r degrees of freedom B. t-distribution withr1 degtees of freedom C. F-distribution with 1 and r degrees of freedom D. F-distribution with r and 1 degrees of freedom E. F-distribution with r and r...
12. As the number of degrees ot trdom ort d n s the the t distribution andd the standard nomal dist becomes larger b becomes smalter stays the same huctuates. d. 13. In interval esionation, thet distribution is applicatle ondy when a. the population has a mean of tess than 30 b. the sample standard deviation is used to estimate the population standard deviation the variance of the population is known d. the mean of the population is unknown. C....
Chapter 6, Section 4-D, Exercise 184 Use a t-distribution to answer this question. Assume the samples are random samples from distributions that are reasonably normally distributed, and that a t-statistic will be used for inference about the difference in sample means. State the degrees of freedom used. Find the endpoints of the-distribution with 2.5% beyond them in each tail if the samples have sizes ni-17 and n2-27. Enter the exact answer for the degrees of freedom and round your answer...
7)The value for χ right for a 95% confidence interval when n-15 is 26.1 19. 7) A) False B) True 8) A study of nickels showed that the the standard deviation of the weight of nickels is 150 8) milligrams. A coin counter manufacturer wishes to find the 90% confidence interval for the average weight of a nickel. How many nickels does he need to weigh to obtain an average accurate to within 25 milligrams? A) 99 B) 139 36...
5. We wish to conduct a hypothesis test of the form Ho : μ1-2-0 vs Ha : μί-μ2 > 0. Both populations are assumed normal with equal variance and samples are assumed independent. We draw 15 observations for the first sample and 17 observations for the second sample. State the distribution of the test statistic for this test. (a) t-distribution with 32 degrees of freedom (b) t-distribution with 30 degrees of freedom (e) Normal distribution with 30 degrees of freedom...
8. Two independent random samples drawn from normal distributions have equal variances and means pli and M2. You are given • The sample mean from the first sample is 16.9. • The sample mean from the second sample is 22.1. • The number of observations from both samples combined is 17. • The upper bound of the 90% confidence interval for H1 - H2 is 1.44. Let tay be the critical value of a t random variable with v degrees...
8. Two independent random samples drawn from normal distributions have equal variances and means and p2. You are given The sample mean from the first sample is 16.9 The sample mean from the second sample is 22.1 The number of observations from both samples combined is 17 The upper bound of the 90% confidence interval for -2 is 1.44 Let tbe the critical value of a t random variable with v degrees of freedom. The foll owing table lists values...
4 pts Question 20 Consider taking random samples of size 50 from Population A with mean 15 and standard deviation 3 and random samples of size 75 from Population B with mean 10 and standard deviation 5. Use the provided formula sheet to calculate the standard error of the distribution of differences in sample means, T-58 Standard error = (Select) How many degrees of freedom should be used when conducting inference for ид - ив with samples of this size?...
. Let W and V be independent random variables where W has a normal distribution with mean equal to Q and variance equal to , and V has açhi-square distribution with r degrees of freedom. V7 then what is the distribution of T A. t-distribution with r degrees of freedom B. t-distribution withr1 degtees of freedom C. F-distribution with 1 and r degrees of freedom D. F-distribution with r and 1 degrees of freedom E. F-distribution with r and r...
Most questions answered within 3 hours.
-
How many ways can 2 people be chosen and arranged in a straight
line if there...
asked 29 minutes ago -
(Problem 1d). Leandro has 16 hours per day that he can allocate
to work or leisure....
asked 1 hour ago -
Morganton Company
makes one product and it provided the following information to help
prepare the master...
asked 1 hour ago -
2Al + 3Cl2 --> 2AlCl3
If one mole Al is reacted w two moles Cl2, how...
asked 2 hours ago -
1. You will see some trends in the movement of each currency vs.
the US Dollar....
asked 2 hours ago -
9. (9 pts) An investor with a stock portfolio worth several
hundred thousand dollars sued his...
asked 2 hours ago -
Which statement is true?
a. Unless directed otherwise, the computer automatically
executes C. statements one before...
asked 3 hours ago -
When a new company is considering Speed to Market for a product
launch, which would provide...
asked 3 hours ago -
bacteria and their metabolites could either promote or protect from
cancer. Explain one of these cases...
asked 4 hours ago -
Use the sample data and confidence level given below to complete
parts (a) through (d).
A...
asked 4 hours ago -
During laser vision correction, a brief burst of 193 nm
ultraviolet light is projected onto the...
asked 4 hours ago -
1 ) How well does the initial speed, v0,calculated from Equation
4 agree with the value...
asked 4 hours ago