BASIC CONCEPTS IN STATISTICS Identify each as a variable or a constant : 2.1. Th
ID: 3020356 • Letter: B
Question
BASIC CONCEPTS IN STATISTICS
Identify each as a variable or a constant:
2.1. The number of months in a year.
2.2 The gender of female business students in a study designed to investigate their career aspirations.
2.3. The age when people choose to retire.
2.4. The GMAT scores of the senior business class students.
Identify each variable as continuous or discrete:
2.5. Grade level
2.6. Age
2.7. Height
2.8. Number of children in a family
Identify each as nominal, ordinal, interval, or ratio:
2.9. The TV channel watched the most on Thursday night in four cities.
2.10. The percentage of respondents watching each TV program at 8:00pm on Thursday.
2.11. Ranking of the 5 most important problems in the U.S.A. today.
2.12. List of GMAT scores for the business schools in the county.
2.13. Classification of students by the state where they were born.
2.14. The number of residents in six different states.
2.15. Class rank.
Classify each as descriptive or inferential statistics:
2.16 The mean quality scores of all the plants owned by a company.
2.17. The results of the TV ratings as obtained by A.C. Nielsen for 3000 households with the people-meter (the "black box").
2.18 The number of employees signing up for a new health insurance plan.
2.19 The blood pressure of a group of volunteers given a new experimental drug to lower blood pressure.
Fill in the blanks:
2.20 The most important characteristic of a good sample is that it is _________ of the population.
2.21. A study where numerical information about the total population is gathered by including all members of the population is called a __________.
2.22. The sample's statistics are used to estimate the population's _________.
2.23. When every 20th person is chosen from a group of 1000 people, we obtain a __________ sample.
2.24. A hypothesis that predicts that there is a difference or relationship between variables or groups is called the __directional________ hypothesis, and is represented by the symbol HA or H1.
2.25. When means from two groups are compared, the null hypothesis states that the difference between the means is _________.
2.26. In order to decide whether the null hypothesis should be rejected or retained, the sample statistic obtained as a result of the statistical calculations is compared to the appropriate __________, found usually in a table in an appendix in statistics books.
2.27. In many statistical tests, degrees of freedom (df) are calculated by subtracting 1 from _______.
Circle the correct answer:
A biased sample contains a random/systematic error.
A random sample is always/may not always be representative of the population from which it was selected.
2.30. To analyze data measured on a nominal scale, researchers should use parametric/nonparametric statistics.
2.31. The information gained about the sample is used to generalize to the population and to estimate its values in descriptive/inferential statistics.
2.32 Inferential statistics may/may not include descriptive statistics, such as the mean.
Explanation / Answer
2.1.) Constant
2.2) Variable
2.3) Variable
2.4) Variable
2.5.) Discrete
2.6.) Continuous
2.7.) Continuous
2.8.) Discrete
2.9.) Nominal
2.10.) Interval
2.11) Ordinal
2.11) Nominal
2.12) Nominal
2.13.) Ordinal
2.14.) Nominal
2.15.) Ordinal
2.16.) Descriptive
2.17.) Inferential
2.18.) Descriptive
2.19.) Descriptive
2.20.) Subset
2.21.) Descriptive statistics
2.22.) Parameters
2.23.) 50
2.24.) Alternative
2.25.) Equal
2.26.)critical value
2.27.) Sample size
2.28.) Random
2.29.) Is always
2.30.) Parametric
2.31.) Descriptive
2.32.) May
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