If a sample size (n) is small, a true effect (g., a true difference between the...
If a sample size (n) is small, a true effect (g., a true difference between the sample mean and population mean) might be __________ even though the true effect __________ .
-
missed; is real
missed; is not real
detected ; is real
detected; is not real
There is no relationship between sample size and likelihood of missing the effect.
-
Unlike a z-test, a one sample t-test can be used when:
sample size is large
population is not known to be normally distributed
population standard deviation is unknown
population mean is unknown
Homework Answers
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If a sample size (n) is small, a true effect (g., a true
difference between the...
6. Interval estimation, z, t, and sample size Aa Aa Which of the following statements about...
6. Interval estimation, z, t, and sample size Aa Aa Which of the following statements about the confidence interval for a population mean are true? Check all that apply. when σ is known, Χ Ζα/2ƠNn is a good interval approximation, provided the population is normally distributed when σ is unknown, x ta/2s Nn is a good interval approximation, provided the sample size is sufficiently large. when σ is known, X za/20, Vn is a good interval approximation, provided the sample...
8. A random sample of 25 college males was obtained and each was asked to report...
8. A random sample of 25 college males was obtained and each was
asked to report their actual height and what they wished as their
ideal height. A 95% confidence interval for μd= average difference
between their ideal and actual heights was 0.8" to 2.2". Based on
this interval, which one of the null hypotheses below (versus a
two-sided alternative)can be rejected?
A. H0: μd= 0.5
B. H0: μd= 1.0
C. H0: μd= 1.5
D. H0: μd= 2.0
9. The...
What would be the effect size for the effect of the new learning tool on San...
What would be the effect size for the effect of the new learning tool on San Diego Community College student learning outcomes given the difference between the population average of 80 and the sample of students who showed a mean test score of 83 and that the population standard deviation was 6? Use Cohen’s d to compute the effect size and identify the correct magnitude of the effect. Choose the answer that is entirely correct. Group of answer choices Cohen’s...
What is the effect size for a sample M = 10.0 (n = 25), with a...
What is the effect size for a sample M = 10.0 (n = 25), with a normal population of µ = 15.0, and a standard deviation of σ = 5.00. Note that some of the information provided is not needed. Cohen's d = 0.1, a small effect size. Cohen's d = 0.5, a medium effect size. Cohen's d = 0.8, a large effect size. Cohen's d = 1.0, a large effect size.
What can be said about the relationship between the significance and the effect size of a...
What can be said about the relationship between the significance and the effect size of a hypothesis test? Group of answer choices The significance of a test is not determined by the effect size alone. A significant test result leads to a large effect size while a non-significant test result leads to a small effect size. The effect size is determined by the alpha level while the significance of a test is not. The effect size is always the same...
Suppose that a sample of size 10 is selected from a population with unknown variance. If...
Suppose that a sample of size 10 is selected from a population with unknown variance. If this information is used to construct a confidence interval for a single population mean, which of the following statements is true? Select the best answer. The sample of size 10 must be normally distributed. The standard normal distribution must be used to construct the confidence interval. The sample mean cannot be used as a point estimate for the population mean because the sample size...
Suppose that a random sample of size 1 is to be taken from a finite population...
Suppose that a random sample of size 1 is to be taken from a finite population of size N. Answer parts (a) through (c) below. a. How many possible samples are there? A. N + 1 B. N-1 0 C. N D. 1 b. Identify the relationship between the possible sample means and the possible observations of the variable under consideration. Choose the correct answer below. A. Each possible sample mean is equal to an observation, only if the population...
At a large grocery store, based on a sample of size 15 , the cashier error...
At a large grocery store, based on a sample of size 15 , the cashier error has a sample mean of 27.6 dollars per day and a standard deviation of 5.0 dollars. Find a 87% confidence interval for the population cashier error. You may assume that the cashier errors are normally distributed. Answer: We are 87% confident that the true population mean of cashier error lies somewhere between and
To test H0: σ= 2.3 versus H1 : σ> 2.3, a random sample of size n...
To test H0: σ= 2.3 versus H1 : σ> 2.3, a random sample of size n = 18 is obtained from a population that is known to be normally distributed. Complete parts (a) through (d). (a) If the sample standard deviation is determined to be s- 2.1, compute the test statistic. z(Round to three decimal places as needed,) TO test H0: ơ-1.4 versus H1 : ơt 1.4, a random sample of size n-21 is obtained from a population that is...
A simple random sample of size n= 13 is obtained from a population with u =...
A simple random sample of size n= 13 is obtained from a population with u = 66 and o = 18. (a) What must be true regarding the distribution of the population in order to use the normal model to compute probabilities involving the sample mean? Assuming that this condition is true, describe the sampling distribution of x. (b) Assuming the normal model can be used, determine P(x<69.2). (c) Assuming the normal model can be used, determine P(x267.5). (a) What...
6. Interval estimation, z, t, and sample size Aa Aa Which of the following statements about the confidence interval for a population mean are true? Check all that apply. when σ is known, Χ Ζα/2ƠNn is a good interval approximation, provided the population is normally distributed when σ is unknown, x ta/2s Nn is a good interval approximation, provided the sample size is sufficiently large. when σ is known, X za/20, Vn is a good interval approximation, provided the sample...
8. A random sample of 25 college males was obtained and each was
asked to report their actual height and what they wished as their
ideal height. A 95% confidence interval for μd= average difference
between their ideal and actual heights was 0.8" to 2.2". Based on
this interval, which one of the null hypotheses below (versus a
two-sided alternative)can be rejected?
A. H0: μd= 0.5
B. H0: μd= 1.0
C. H0: μd= 1.5
D. H0: μd= 2.0
9. The...
Suppose that a random sample of size 1 is to be taken from a finite population of size N. Answer parts (a) through (c) below. a. How many possible samples are there? A. N + 1 B. N-1 0 C. N D. 1 b. Identify the relationship between the possible sample means and the possible observations of the variable under consideration. Choose the correct answer below. A. Each possible sample mean is equal to an observation, only if the population...
To test H0: σ= 2.3 versus H1 : σ> 2.3, a random sample of size n = 18 is obtained from a population that is known to be normally distributed. Complete parts (a) through (d). (a) If the sample standard deviation is determined to be s- 2.1, compute the test statistic. z(Round to three decimal places as needed,) TO test H0: ơ-1.4 versus H1 : ơt 1.4, a random sample of size n-21 is obtained from a population that is...
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