Homework Answers
The mean of t distribution is 0 and variance of t distribution is depends upon the sample size. Variance of t distribution is not equal to 1.
Hence, correct option is D.
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Which of the following is not a characteristic of the t test? Choose the correct answer...
Describe the standard normal distribution. What are its characteristics? Choose the correct answer below. O A....
Describe the standard normal distribution. What are its characteristics? Choose the correct answer below. O A. The standard normal distribution is a normal probability distribution with mean u = 0 and standard deviation o = 1. Similar to any normal probability distribution, it has associated with it a bell-shaped curve, symmetric about a vertical line through u with inflection points at o and -o. The Z-scores theorem, along with a table of areas under this standard normal curve can be...
Pick the correct answer A-The key characteristic to distinguish between using a T test and a...
Pick the correct answer A-The key characteristic to distinguish between using a T test and a Z test is: Group of answer choices i)whether the sample is normally distributed ii)whether μ is known iii)sample size iv)whether σ is known B- A sampling distribution of means is: i)used for estimating a sample mean ii)tends to be skewed iii)sometimes based on different sized samples. iv)used for estimating population means C-Parameter is to population as statistic is to: i)sampling ii)inferential iii)sample iv) class...
for the standard normal distribution, which of the following is not correct? a. mean is 0...
for the standard normal distribution, which of the following is not correct? a. mean is 0 and variance is 1 b. it is a discrete distribution c. it has bell shape
Indicate the correct test procedure and reasoning. A researcher wishes to determine whether listening to music...
Indicate the correct test procedure and reasoning. A researcher wishes to determine whether listening to music affects students' performance on memory test. He randomly selects 50 students and has each student perform a memory test once while listening to music and once without listening to music. He obtains the mean and standard deviation of the 50 "with music" scores and obtains the mean and standard deviation of the 50 "without music scores" O Two-sample t-test, since the researcher has two...
QUESTION 5 Which statement concerning the t-distribution is false? O AT follows a standard normal distribution...
QUESTION 5 Which statement concerning the t-distribution is false? O AT follows a standard normal distribution OB. The smaller the degrees of freedom the flatter the curve. OC. The t-distribution has a larger standard deviation than the Standard Normal Curve. OD. T-distributions have a mean of 0. o E. The total area under the density curve depends on the degrees of freedom. QUESTION 6 The t-procedures are robust when A. sample size is 12 and the sample data is not...
Which of the following are the characteristics of the population distribution? (Hint: 2 correct answers.) The...
Which of the following are the characteristics of the population distribution? (Hint: 2 correct answers.) The population distribution is centered on zero. The population distribution has a standard deviation of 1. The population distribution changes depending on the sample size we use The population distribution can have a smaller standard deviation than the sampling distribution of the sample mean. The population distribution has a standard deviation of We use the population distribution when we have information only on a subsample...
Multiple Choice Question We studied a characteristic of iron. Under the normality assumption of its distribution...
Multiple Choice Question We studied a characteristic of iron. Under the normality assumption of its distribution and using its sample mean and standard deviation, we computed the following confi- dence interval [2271.7688, 2308.2312]. This interval is a confidence interval for the mean of that characteristic at a level of confidence of 90%. We are told the the sample size is 16 and the sample mean is T 2290. What is the value of the sample standard deviation s? A. 44.33...
Which of the following statements about the sampling distribution of the sample mean, x-bar, is not...
Which of the following statements about the sampling distribution of the sample mean, x-bar, is not true? The distribution is normal regardless of the shape of the population distribution, as long as the sample size,n, is large enough. The distribution is normal regardless of the sample size, as long as the population distribution is normal. The distribution's mean is the same as the population mean. The distribution's standard deviation is smaller than the population standard deviation. All of the above...
For which of the following is a t-test appropriate for performing a hypothesis test? Select the...
For which of the following is a t-test appropriate for performing a hypothesis test? Select the correct answer below: O A sample mean of 33 pounds and a standard deviation of 3 pounds are obtained using a simple random sample of 18 mountain bikes from the most popular bicycles offered by major retailers having approximately normally distributed weights. The population standard deviation is 2.4 pounds. O A simple random sample of 12 two-inch candles is taken from the candles offered...
A psychologist has developed an aptitude test which consists of a series of mathematical and vocabulary...
A psychologist has developed an aptitude test which consists of a series of mathematical and vocabulary problems. They are interested in estimating the mean score for all those who take the test. A random sample of 51 people have taken the test and the mean test score for the sample is 65. The sample standard deviation for this group is 9.7 Calculate the 95% confidence interval for the mean test score. Give your answers to 2 decimal places. True False...
Describe the standard normal distribution. What are its characteristics? Choose the correct answer below. O A. The standard normal distribution is a normal probability distribution with mean u = 0 and standard deviation o = 1. Similar to any normal probability distribution, it has associated with it a bell-shaped curve, symmetric about a vertical line through u with inflection points at o and -o. The Z-scores theorem, along with a table of areas under this standard normal curve can be...
Indicate the correct test procedure and reasoning. A researcher wishes to determine whether listening to music affects students' performance on memory test. He randomly selects 50 students and has each student perform a memory test once while listening to music and once without listening to music. He obtains the mean and standard deviation of the 50 "with music" scores and obtains the mean and standard deviation of the 50 "without music scores" O Two-sample t-test, since the researcher has two...
QUESTION 5 Which statement concerning the t-distribution is false? O AT follows a standard normal distribution OB. The smaller the degrees of freedom the flatter the curve. OC. The t-distribution has a larger standard deviation than the Standard Normal Curve. OD. T-distributions have a mean of 0. o E. The total area under the density curve depends on the degrees of freedom. QUESTION 6 The t-procedures are robust when A. sample size is 12 and the sample data is not...
Which of the following are the characteristics of the population distribution? (Hint: 2 correct answers.) The population distribution is centered on zero. The population distribution has a standard deviation of 1. The population distribution changes depending on the sample size we use The population distribution can have a smaller standard deviation than the sampling distribution of the sample mean. The population distribution has a standard deviation of We use the population distribution when we have information only on a subsample...
Multiple Choice Question We studied a characteristic of iron. Under the normality assumption of its distribution and using its sample mean and standard deviation, we computed the following confi- dence interval [2271.7688, 2308.2312]. This interval is a confidence interval for the mean of that characteristic at a level of confidence of 90%. We are told the the sample size is 16 and the sample mean is T 2290. What is the value of the sample standard deviation s? A. 44.33...
For which of the following is a t-test appropriate for performing a hypothesis test? Select the correct answer below: O A sample mean of 33 pounds and a standard deviation of 3 pounds are obtained using a simple random sample of 18 mountain bikes from the most popular bicycles offered by major retailers having approximately normally distributed weights. The population standard deviation is 2.4 pounds. O A simple random sample of 12 two-inch candles is taken from the candles offered...
A psychologist has developed an aptitude test which consists of a series of mathematical and vocabulary problems. They are interested in estimating the mean score for all those who take the test. A random sample of 51 people have taken the test and the mean test score for the sample is 65. The sample standard deviation for this group is 9.7 Calculate the 95% confidence interval for the mean test score. Give your answers to 2 decimal places. True False...
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