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Stat 1342 Review 1
Chapter 1, 2, 3 and 10 Review Questions
| Question | Answer |
|---|---|
| How are statistics important in our everyday lives, and why do we need to understand them? | Statistics are used to analyze the results of surveys. It is important to understand the terms and concepts so that one can understand exactly what is being represented (or misrepresented) by a given statement. |
| Inferential statistics is based on probability. True or False | True |
| A ______________ consists of all subjects that are being studied. | population |
| ______________ is a decision-making process for evaluating claims about a population, based on information obtained from samples. | Hypothesis testing |
| Based on her electric bills from last year, Mrs. Smith expects she will be paying $75/month this year. This is an example of descriptive statistics. True or False | False |
| A ______________ variable assumes values that can be counted. | discrete |
| Quantitative data can be further classified as continuous or nonsequential. True or False | False |
| Rating a restaurant by a number of stars is an example of an ordinal level of measurement. True or False | True |
| The _______________ level of measurement classifies data into categories that can be ranked; however, precise differences between the ranks do not exist. | ordinal |
| A person's hair color would be an example of a quantitative variable. True or False | False |
| The variable of height is an example of a quantitative variable. True or False | True |
| The number of birds in a tree is an example of a continuous variable. True or False | False |
| The four basic methods used to obtain samples are: random, irregular, cluster, and stratified sampling. True or False | False |
| ______________ sampling is used when the population is large and it includes subjects residing over a large geographic area. | Cluster |
| Questioning every 14th customer leaving a theatre about the movie they had seen, would be an example of systematic sampling. True or False | True |
| When running an experimental study, the group that is manipulated can be called the treatment group. True or False | True |
| One advantage of a(n) ______________ study is that it occurs in a natural setting without intervention by the researcher. | observational |
| Explain qualitative variables | Qualitative variables are variables that have distinct categories according to some characteristic or attribute. For example, if subjects are classified according to gender, religious preference and geographic locations. |
| Explain quantitative variables | Quantitative variables are variables that can be counted or measured. For example agee variables are heights, weights, and body temperatures. |
| Explain discrete variables | Discrete variables can be assigned values such as 0, 1, 2, 3 and are said to be countable. Examples of discrete variables are the # of children in a family, the # of students in a classroom. |
| Explain continuous variables. | Continuous variables can assume an infinite number of values between any two specific values. They are obtained by measuring. They often include fractions and decimals. |
| When data are collected in original form, they are called __________. | raw data |
| If a frequency distribution had class boundaries of 132.5–147.5, what would be the class width? | 15 |
| If the limits for a class were 20–38, the boundaries would be 19.5–38.5. True or False | True |
| For the class 16.3–23.8, the width is 8.5. True or False | False |
| The three most commonly used graphs in research are the histogram, the __________, and the cumulative frequency graph (ogive). | frequency polygon |
| For a given data set, the ogive and the frequency polygon will have the same overall shape. True or False | False |
| A histogram is a graph that represents the cumulative frequencies for the classes in a frequency distribution. True or False | False |
| A time series graph represents data that occur over a specific time period. True or False | True |
| A time series graph is useful for detecting trends that occur over the period of time. True or False | True |
| A __________ graph would most appropriately represent the number of students that were enrolled in Statistics for each of the past ten years. | time series |
| A stem and leaf plot has the advantage over a grouped frequency distribution of retaining the actual data while still showing them in graphical form. True or False | True |
| A Pareto chart is useful for showing percentages of the total at different times. True or False | False |
| When two sets of data collected over specific periods of time are compared on the same graph using two lines, it is called a compound time series graph. True or False | True |
| In a __________ relationship, as one variable increases, the other variable decreases, and vice versa. | negative |
| What is the midpoint of the class 16–19 ? | 17 |
| A weighted mean is used when the values of the data set are not all equally represented. A) True B) False | True |
| A ______________ is the midpoint in a data array. | median |
| The range of a data set is the difference between the highest value and the lowest value. True False | True |
| The _______________and ______________ are two measures of variation used to describe the spread of the data in a data set. | Two of three: variance, standard deviation, and range. |
| The ______________ is the average of the squares of the distance each value is from the mean | variance |
| Find the range of the set of values 5, 17, 3, 10, and 5. | 14 |
| Given that the variance for a data set is 1.20, what is the standard deviation? | 1.10 |
| If a set of data has mean 48 and variance 25, then it's coefficient of variation is ________. | 10.4 |
| Given that the mean of a set of data is 25 and the standard deviation is 3, what is the coefficient of variation? | 12 |
| ______________ divide a distribution into four groups, and __________divide a distribution into ten groups. | Quartiles; deciles |
| A baseball player has a batting average of 0.325 each week of the season, with a standard deviation of 0.065. What is the z score when he bats 0.410 one week? | 1.308 |
| Given the following data set, find the approximate value that corresponds to the 75th percentile. 10, 44, 15, 23, 14, 18, 72, 56 | 50 |
| Check the following data set for outliers. 33, 42, 44, 44, 46, 47, 49, 51 | 9. 33 is an outlier. Q1=43, Q3 = 48 IRQ = 5 Lower = 38 Upper = 53 |
| A five-number summary of a data set consists of the minimum, Q1, the median, Q 3, and the maximum. True or False | True |
Created by:
crisfreiley
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