Stats

Which of the following statements is correct? (A) Chebyshev's inequality applies to all distributions regardless of shape (B) The empirical rule is less precise than Chebyshev's inequality (C) Chebyshev's inequality only work for bell-shaped distributions (D) The empirical rule applies to all distributions regardless of shape

(A) Chebyshev's inequality applies to all distributions regardless of shape

Which of the following statements is true for the following data values: 17, 15, 16, 14, 17, 18, and 22? (A) The mean, median and mode are all equal. (B) Only the mean and median are equal. (C) Only the median and mode are equal. (D) The mean, median and mode are all different.

(A) The mean, median and mode are all equal.

Which of the following statements is correct? (A) A data set will have exactly one mode. (B) When a histogram is skewed right, the mean is greater than median (C) When a histogram is symmetric, the mean is greater than median (D) When a histogram is skewed right, the mean is a better measure of central tendency than the median.

(B) When a histogram is skewed right, the mean is greater than median

You asked ten of your classmates about their weight. On the basis of this information, you stated that the average weight of all students in your university or college is 158 pounds. This is an example of: (A) descriptive statistics (B) statistical inference (C) population (D) sample and population

(B) statistical inference

The sum of the frequencies for all classes will always equal: (A) the class width (B) the total number of observations in the data set (C) one (D) the average

(B) the total number of observations in the data set

Which of the following give the definition of statistics? (A) Statistics is the science of manipulating, reorganizing, and editing information to produce the desired results. In addition, statistics is about providing the required answer with the desired level of confidence. (B) Statistics encompasses all scientific disciplines in which random occurrences are analyzed. In addition, statistics references any random occurrence which is reported using percentages or proportions. (C) Statistics is the science of collecting, organizing, summarizing, and analyzing information to draw a conclusion and answer questions. In addition, statistics is about providing a measure of confidence in any conclusions. (D) Statistics encompasses all scientific disciplines in which percentages are used, data are analyzed, and probabilities are found. In addition, statistics references any mathematical model which is reported using percentages or proportions.

(C) Statistics is the science of collecting, organizing, summarizing, and analyzing information to draw a conclusion and answer questions. In addition, statistics is about providing a measure of confidence in any conclusions.

The following data represent a sample of 10 scores on a 20-point statistics quiz: 16, 16, 16, 16, 16, 18, 18, 20, 20, and 20. After the mean, median, range and variance were calculated for the scores, it was discovered that one of the scores of 20 should have been an 18. Which of the following will change when the calculations are redone using the correct scores? (A) mean and range (B) median and range (C) mean and variance (D) mean, range, median and variance

(C) mean and variance

Which sampling of the following sampling technique selects every kth individual from the population? (A) Stratified Sampling (B) Simple Random Sampling (C) Cluster Sampling (D) Systematic Sampling

(D) Systematic Sampling

Which of the following is not the goal of descriptive statistics? (A) summarizing data (B) displaying aspects of the collected data (C) reporting numerical findings (D) estimating characteristics of the population based on a sample

(D) estimating characteristics of the population based on a sample

The entire group to be studied is called the ________________

Population

A numerical summary of a sample is called ________________

Statistic

A histogram of a set of data indicates that the distribution of the data is skewed left. Which measure of central tendency will likely to be small, the mean or the median?

The mean will likely be small because the extreme values in the left tail tend to pull the mean in the direction of the tail.

The two graphical techniques we usually use to present qualitative data are

bar chart and pie chart

What are the measures of central tendency?

mean, median, mode