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Study Resources (Statistics)

81) An education researcher was interested in examining the effect of the teaching method and the 81) effect of the particular teacher on students' scores on a reading test. In a study, there are four different teachers (Juliana, Felix, Sonia, and Helen) and three different teaching methods  (method A, method.
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List all possible samples from the specified population. 36) The finalists in an essay competition are Lisa (L), Melina (M), Ben (B), Danny (D),  Eric (E), and 36) Joan (J). Consider these finalists to be a population of interest. List the 15 possible samples (without replacement) of size two from this.
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81) The table gives the frequency distribution for the data involving the number of radios per household for a sample of 80 U.S. households. Construct a frequency histogram. 82) gives the frequency distribution for the data involving the number of radios per household for a sample of 80 U.S. households. Construct a relative.
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31) A variable whose values are observed by counting something must be a discrete variable. A) True B) False 32) The set of possible values that a variable can take constitutes the data. A) True B) False 33) A discrete variable can only yield whole- number values. A) True B) False 34) A variable whose possible.
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1) The table below shows the number of new AIDS cases in the U.S. in each of the years 1989- 1994. Year New AIDS cases 1989 33,643 1990 41,761 1991 43,771 1992 45,961 1993 103,463 1994 61,301 Classify the study as either descriptive or inferential. A) Descriptive B) Inferential 2) The table below shows the average income by age group for the residents of one town.
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88) Explain the difference between an observational study and a designed experiment. 88) 89) An education researcher wishes to assess the effectiveness of three different methods for teaching young children to read. The 380 children participating in the study are divided into three groups. The study runs for six months. The.
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31) Fill in the following blanks: The two major types of statistics are ______________ statistics and ___________ statistics. 32) Define the terms population and sample. 33) Define observational study and designed experiment. 34) Why do statisticians sometimes use inferential statistics to draw conclusions about a population? In what situations might a statistician draw.
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Provide an appropriate response. 18) Define statistically stable (or "within statistical control"). Show examples of run charts which illustrate processes which are not statistically controlled. Discuss the pattern which indicates the process is not statistically controlled for each example. Use the given process data to construct a control chart for p. 19).
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Provide an appropriate response. 10) Describe the three criteria used to determine if a control chart indicates a process which is 10) not statistically stable. Examine the given run chart or control chart and determine whether the process is within statistical control. If it is not, identify which of the three out-of-statistical-control.
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65) Define the terms "stratified sampling", "systematic sampling" and "cluster sampling". Give examples for each. 66) Which method of sampling is easier: simple random sampling or systematic random sampling? 67) Describe the steps involved when using stratified random sampling with proportional allocation. What are the advantages of this sampling method? 68) Describe the.
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Construct a relative-frequency polygon for the given data. 124) The table contains the frequency and relative- frequency distributions for the ages of the employees in a particular company department. 125) The table contains data from a study of daily study time for 40 students from Statistics 101. In  constructing an ogive from.
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127) When organizing data into tables, what is the disadvantage of having too many classes? What is the disadvantage of having too few classes? 128) Anna set up a frequency distribution with the following classes: Number of sick days taken Frequency 0- 3 3- 6 6- 9 9- 12 What is wrong with these classes? Describe.
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Provide an appropriate response. 41) The finalists in an essay competition are Lisa (L), Melina (M), Ben (B), Danny (D),  Eric (E), and Joan (J). Consider these finalists to be a population of interest. The  possible samples (without replacement) of size two that can be obtained from this population of six finalists.
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Given the following "data scenario," decide which type of grouping (single-value, limit, or cutpoint) is probably the best. 58) Number of Pets: The number of pets per family. A) None of these B) Single- value grouping C) Limit grouping D) Cutpoint grouping 59) Exam Scores: The exam scores, rounded to the nearest whole number,.
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Classify the data as either discrete or continuous. 10) The number of freshmen entering college in a certain year is 621. A) Discrete B) Continuous 11) The average height of all freshmen entering college in a certain year is 68.4 inches. A) Discrete B) Continuous 12) An athlete runs 100 meters in 10.7 seconds. A) Discrete.
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130) Maria constructed the frequency distribution shown below.  The data represent the heights of 60 randomly selected women. Height   Frequency 54- under 60   7 60- under 61 1 61- under 62 3 62- under 63 5 63- under 64 7 64- under 65 7 65- under 66 6 66- under 72 24 She concluded from her frequency distribution that the.
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118) The partially filled contingency table gives the frequencies of the data on age (in years) and sex from the residents of a retirement home. What percentage of residents are female ? A) 31% B) 30.4% C) 30% D) 29.5% 119) The partially filled contingency table gives the relative frequencies of the data.
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79) The table gives the frequency distribution for the data involving the number of television sets per household for a sample of 100 U.S. households. Construct a frequency histogram. 80) gives the frequency distribution for the data involving the number of television sets per household for a sample of 100 U.S. households. Construct.
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A designed experiment is described. Identify the specified element of the experiment. 73) In a clinical trial, 780 participants suffering from high blood pressure were randomly assigned to one of three groups. Over a one- month period, the first group received a low dosage of an experimental drug, the second group.
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21) A large record company reported the following sales figures for various music media last year. Identify the variable under consideration in the second column? A) media B) $ millions C) CD single D) sales 22) The following table gives the top five movies at the box office this week. Identify the variable under.
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11) A magazine publisher mails a survey to every subscriber asking about the quality of its subscription service.  The total number of subscribers represents what? A) The population B) The sample 12) A magazine publisher mails a survey to every subscriber asking about the timeliness of its subscription service.  The publisher finds.
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Provide an appropriate response. 23) A control chart for attributes is to be constructed. Which process would have wider 23) control limits, a process which has been having a 5% rate of nonconforming items, or a process which has been having a 10% of nonconforming items? Assume that both processes have.
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49) Define simple random sampling. Explain why this is important in design of experiments. 50) Define probability sampling. Identify some advantages of probability sampling. 51) A political researcher wishes to gauge political sentiment regarding a proposed tax cut. He obtains a list of 1000 email addresses from an internet provider, uses a.
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