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The process of using sample statistics

Q1. The process of using sample statistics to draw conclusions about a population is called    a. inferential statistics    b. the scientific method.    c. sampling.    d. descriptive statistics.Q2. Those methods involving the collection, presentation, and characterization of a set of data in order to properly describe the various features of that set of data are called    a. statistical inference.    b. the scientific method.    c. sampling.    d. descriptive statistics.Q3. Most analysts focus on the cost of tuition as the way to measure the cost of a college education. But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand University wishes to estimate the textbook costs of first-year students at Drummand. To do so, she monitored the textbook cost of 250 first-year students and found that their average textbook cost was $300 per semester. Identify the variable of interest to the researcher.    a. The textbook cost of first-year Drummand University students.    b. The year in school of Drummand University students.    c. The age of Drummand University students.    d. The cost of incidental expenses of Drummand University students.Q4. A study attempted to estimate the proportion of Florida residents who were willing to spend more tax dollars on protecting the beaches from environmental disasters. Twenty-five hundred Florida residents were surveyed. What type of data collection procedure was most likely used to collect the data for this study?    a. A designed experiment    b. A published source    c. A random sample    d. Observational dataQ5. The collection and summarization of data related to employees of a particular firm is an example of    a. inferential statistics.    b. descriptive statistics.    c. a parameter.    d. a statistic.Q6. The classification of student majors (for example, accounting, economics, management, and marketing) is an example of what type of data?    a. categorical    b. discrete    c. continuous    d. numericalQ7. The universe or “totality of items or things” under consideration is called    a. a sample.    b. a population.    c. a parameter.    d. a statistic.Q8. The chancellor of a major university was concerned about alcohol abuse on her campus and wanted to find out the proportion of students at her university who visited campus bars on the weekend before the final exam week. Her advisor took a random sample of 250 students. The total number of students in the sample who visited campus bars on the weekend before the final exam week is an example of    a. a categorical random variable.    b. a discrete random variable.    c. a continuous random variable.    d. a parameter.Q9. An insurance company evaluates many numerical variables about a person before deciding on an appropriate rate for automobile insurance. A representative from a local insurance agency selected a random sample of insured drivers and recorded the number of claims each made in the last 3 years.# of claims# of drivers1142183124551Referring to the table,how many total claims are represented in the sample?    a. 15    b. 50    c. 111    d. 250Q10. A common misuse of graphs is:    a. have no zero point on the vertical axis.    b. have equally spaced intervals on the horizontal axis.    c. clearly label the axes.    d. show proportions using percentages.Q11. The _____ applies when the majority of items in a set of data occur in a small number of categories, and the few remaining observations are spread out over many categories.    a. sampling error correction    b. biased observation problem    c. asymmetric distribution factor    d. Pareto principleQ12. To the student patterns in the value of variables over time, you would use a(n):    a. side-by-side bar chart    b. histogram    c. scatter diagram    d. time-series plotQ13. When you want to present information about the percentage of values that are less than a certain value, use a(n):    a. relative frequency distribution    b. cumulative distribution    c. pie chart    d. histogramQ14. A type of vertical bar chart in which the categories are plotted in the descending rank order of the magnitude of their frequencies is called a    a. contingency table.    b. Pareto diagram.    c. dot plot.    d. pie chart.Q15. You form _____ by dividing the frequencies in each class of the frequency distribution by the total number of observations.    a. percentage distribution    b. relative frequency distribution    c. cumulative distribution    d. None of the above.Q16. Retailers are always interested in determining why a customer selected their store to make a purchase. A sporting goods retailer conducted a customer survey to determine why its customers shopped at the store. The results are shown in the bar chart below. What proportion of the customers responded that they shopped at the store because of the merchandise or the convenience?    a. 35%    b. 50%    c. 65%    d. 85%Q17. In left-skewed distributions, which of the following is the correct statement?    a. The distance from Q1 to Q2 is smaller than the distance from Q2 to Q3.    b. The distance from the smallest observation to Q1 is larger than the distance from Q3 to the largest observation.    c. The distance from the smallest observation to Q2 is smaller than the distance from Q2 to the largest observation.    d. The distance from Q1 to Q3 is twice the distance from the Q1 to Q2.Q18. Which measures of central tendency are the most resistant to extreme values (outliers)?    a. The arithmetic mean and median only.    b. The median and mode only.    c. The mode and geometric mean only.    d. The arithmetic mean and mode only.Q19. Which descriptive statistics are considered to be resistant statistics (i.e., less affected by extreme values)?    a. The arithmetic mean and standard deviation.    b. The interquartile range and range.    c. The mode and variance.    d. The median and interquartile range.Q20. According to the empirical rule, if the data form a bell-shaped distribution, then about _____ percent of the observations will be within plus or minus 2 standard deviations from the mean.    a. 68    b. 97.5    c. 99.7    d. 95Q21. Health care issues are receiving much attention in both academic and political arenas. A sociologist recently conducted a survey of citizens over 60 years of age whose net worth is too high to qualify for Medicaid and have no private health insurance. The ages of 25 uninsured senior citizens were as follows: 60, 61, 62, 63, 64, 65, 66, 68, 68, 69, 70, 73, 73, 74, 75, 76, 76, 81, 81, 82, 86, 87, 89, 90, 92 Calculate the arithmetic mean age of the uninsured senior citizens to the nearest hundredth of a year.     a. 50.09 years    b. 60.04 years    c. 74.04 years     d. 80.04 years Q22. Health care issues are receiving much attention in both academic and political arenas. A sociologist recently conducted a survey of citizens over 60 years of age whose net worth is too high to qualify for Medicaid and have no private health insurance. The ages of 25 uninsured senior citizens were as follows: 60, 61, 62, 63, 64, 65, 66, 68, 68, 69, 70, 73, 73, 74, 75, 76, 76, 81, 81, 82, 86, 87, 89, 90, 92 Calculate the standard deviation of the ages of the uninsured senior citizens correct to the nearest hundredth of a year.     a. 10 years     b. 9.74 years     c. 8.4 years     d. 11 yearsQ23. According to the empirical rule, if the data form a bell-shaped distribution, then about _____ percent of the observations will be within plus or minus 1 standard deviations from the mean.    a. 68    b. 97.5    c. 99.7    d. 95Q24. In right-skewed distributions, which of the following is the correct statement?    a. The distance from Q1 to Q2 is larger than the distance from Q2 to Q3.    b. The distance from Q1 to Q2 is smaller than the distance from Q2 to Q3.    c. The arithmetic mean is smaller than the median.    d. The mode is larger than the arithmetic mean.Q25. The value that appears most frequently in a set of data is called:    a. Arithmetic mean.    b. Median.    c. Mode.    d. Geometric mean.

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