Quiz - 02

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Quiz – 02  Question 1 1.75 out of 1.75 points Confidence intervals are a function of the  Question 2 0 out of 1.75 points According to the empirical rule, how many observations lie within +/- 1 standard deviation from the mean?  Question 3 1.75 out of 1.75 points Given that the random variable X is normally distributed with a mean of 80 and a standard deviation of 10, P (85 X 90) is  Question 4 1.75 out of 1.75 points If two samples contain the same number of observations, then the data must be paired.  Question 5 1.75 out of 1.75 points In general, increasing the confidence level will narrow the confidence interval, and decreasing the confidence level widens the interval.  Question 6 1.75 out of 1.75 points A 90% confidence interval estimate for a population mean is determined to be 72.8 to 79.6. If the confidence level is reduced to 80%, the confidence interval for becomes narrower.  Question 7 1.75 out of 1.75 points According to the empirical rule, how many observations lie within +/- 3 standard deviation from the mean?  Question 8 1.75 out of 1.75 points According to the empirical rule, how many observations lie within +/- 2 standard deviation from the mean?  Question 9 1.75 out of 1.75 points For a given confidence level, the procedure for controlling interval length usually begins with the specification of the

 Question 10 1.75 out of 1.75 points Generally speaking, the two types of statistical inference are  Question 11 1.75 out of 1.75 points In order to construct a confidence interval estimate of the population mean , the value of must be given.  Question 12 1.75 out of 1.75 points In general, the paired-sample procedure is appropriate when the samples are naturally paired in some way and there is a reasonably large positive correlation between the pairs. In this case, the paired-sample procedure makes more efficient use of the data and generally results in narrower confidence intervals.  Question 13 1.75 out of 1.75 points When samples of size n are drawn from a population, then the sampling distribution of the sample mean is approximately normal, provided that n is reasonably large.  Question 14 1.75 out of 1.75 points Samples of exam scores for employees before and after a training class are examples of paired data.  Question 15 1.75 out of 1.75 points If you are constructing a confidence interval for a single mean, the length of the confidence interval will _____ with an increase in the sample size.  Question 16 1.75 out of 1.75 points In developing a confidence interval for the difference between two population means using two independent samples, we use the pooled estimate in estimating the standard error of the sampling distribution of the sample mean difference if the populations are normal with equal variances.  Question 17 1.75 out of 1.75 points A histogram is based on binning the variable, which means putting the values of the numeric variable into discrete categories.

 Question 18 1.75 out of 1.75 points What is an example of a problem in which the sample data is likely to be paired?  Question 19 1.75 out of 1.75 points If you increase the confidence level, the length of the confidence interval  Question 20 1.75 out of 1.75 points When the samples we want to compare pair in some natural way, such as a pretest/posttest for each person or husband/wife pairs, a more appropriate form of analysis is to not construct a confidence interval treating them as two separate variables, but instead to construct a confidence interval to estimate the mean 2 nd Attempt  Question 1 1.75 out of 1.75 points In developing a confidence interval for the difference between two population means using two independent samples, we use the pooled estimate in estimating the standard error of the sampling distribution of the sample mean difference if the populations are normal with equal variances.  Question 2 1.75 out of 1.75 points The standard deviation of a probability distribution is a measure of  Question 3 1.75 out of 1.75 points Samples of exam scores for employees before and after a training class are examples of paired data.  Question 4 1.75 out of 1.75 points In general, increasing the confidence level will narrow the confidence interval, and decreasing the confidence level widens the interval.  Question 5 1.75 out of 1.75 points Confidence intervals are a function of the  Question 6

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1.75 out of 1.75 points If two samples contain the same number of observations, then the data must be paired.  Question 7 1.75 out of 1.75 points When the samples we want to compare pair in some natural way, such as a pretest/posttest for each person or husband/wife pairs, a more appropriate form of analysis is to not construct a confidence interval treating them as two separate variables, but instead to construct a confidence interval to estimate the mean  Question 8 1.75 out of 1.75 points A histogram is based on binning the variable, which means putting the values of the numeric variable into discrete categories.  Question 9 1.75 out of 1.75 points A 90% confidence interval estimate for a population mean is determined to be 72.8 to 79.6. If the confidence level is reduced to 80%, the confidence interval for becomes narrower.  Question 10 1.75 out of 1.75 points When samples of size n are drawn from a population, then the sampling distribution of the sample mean is approximately normal, provided that n is reasonably large.  Question 11 1.75 out of 1.75 points Generally speaking, the two types of statistical inference are  Question 12 1.75 out of 1.75 points According to the empirical rule, how many observations lie within +/- 3 standard deviation from the mean?  Question 13 1.75 out of 1.75 points If you increase the confidence level, the length of the confidence interval  Question 14 1.75 out of 1.75 points In order to construct a confidence interval estimate of the population mean , the value of must be given.

 Question 15 1.75 out of 1.75 points According to the empirical rule, how many observations lie within +/- 2 standard deviation from the mean?  Question 16 1.75 out of 1.75 points What is an example of a problem in which the sample data is likely to be paired?  Question 17 1.75 out of 1.75 points A confidence interval is an interval that, with a stated level of confidence, captures a population parameter.  Question 18 1.75 out of 1.75 points If you are constructing a confidence interval for a single mean, the length of the confidence interval will _____ with an increase in the sample size.  Question 19 1.75 out of 1.75 points In general, the paired-sample procedure is appropriate when the samples are naturally paired in some way and there is a reasonably large positive correlation between the pairs. In this case, the paired-sample procedure makes more efficient use of the data and generally results in narrower confidence intervals.  Question 20 1.75 out of 1.75 points For a given confidence level, the procedure for controlling interval length usually begins with the specification of the

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