04 Sep Statistics
STA2023QUIZ # 1INSTRUCTIONS: Answer all questions. Shade the correct answer in your scantron for each of the questions on the quiz. 1.True or False: A list of the names of all students registered for classes at North Campus for the fall semester 2019 is an example of a population.(a)True(b) False2.What is the level of measurement of data consisting of the book categories of science, literature, mathematics, and history?(a)Nominal(b) Ordinal(c) Interval(d) RatioThe computer giant IBM has 329,373 employees and 637,133 stockholders. A vice-president plans to conduct a survey to study the numbers of shares held by individual stockholders.3.Are the numbers of shares held by stockholders discrete or continuous?(a)Discrete(b) Continuous4.What is the level of measurement for the number of shares held by stockholders?(a)Nominal(b) Ordinal(c) Interval(d) Ratio5.If the survey is conducted by telephoning 50 randomly selected stockholders in each of the 50 Unites States, what type of sampling is being used?(a)Random(b) Systematic(c) Convenience(d) Stratified(e) Cluster6.If a complete list of all stockholders is complied and every 500th name is selected for the survey, what type of sampling is being used?(a)Random(b) Systematic(c) Convenience(d) Stratified(e) Cluster7.If, at the annual stockholders’ meeting, a survey is conducted of all who attend, what type of sampling is being used?(a)Random(b) Systematic(c) Convenience(d) Stratified(e) Cluster8.Data that can be classified according to color are measured on what scale?(a) Nominal(b) Ordinal(c) Interval(d) Ratio 9.In an experiment when the effects from two or more variables cannot be distinguished from each other, what is said to have occurred?(a) Contrasting(b) Blinding(c) Commingling (d) Confounding 10.In the largest public health experiment ever conducted, 200,745 children were given a treatment consisting of the Salk vaccine, while 201,229 other children were given a placebo.The purpose of the experiment was to determine whether the Salk vaccine was effective in combating polio. What was the independent variable in the study?(a)whether the subject received the polio vaccine or not(b)whether the subject contracted polio or not(c)whether the subject was given a placebo or not(d)whether the subject was a male or female child(e)The salk vaccine11.The difference between a sample result and the true population result is knows as :(a) Population Error(b) Sampling Error(c) Non-sampling Error(d) Test Error12.Data that provide information about relative comparisons, but not the magnitude of the differences is known as:(a)Nominal (b) Ordinal(c) Interval(d) Ratio13.For a study in which subjects are treated with a new drug and then observed, is the study observational or is it an experiment?(a) Observational(b) Experiment14.All of the following are ways in which statistics can be misused EXCEPT:(a)Precise Numbers(b) Small Samples(c) Random Samples(d) Order of Questions15.In a ___sample, members from the population are selected in such a way that each individual member in the population has an equal chance of being selected.(a)Systematic(b)Precise(c) Stratified(d) Random16.In a ___ study, data are observed, measured, and collected at one point in time.(a)Prospective(b) Retrospective(c)Rigorous(d) Cross-Sectional17.Data in which differences are meaningful, but there is no natural zero starting point is known as:(a)Nominal(b) Ordinal(c) Interval(d) Ratio18.On the day of the last presidential election, ABC News organized an exit poll in which specific polling stations were randomly selected and all the voters were surveyed as they left the premises. What type of sampling is being used?(a)Random(b) Systematic(c) Convenience(d) Cluster19.Determine whether the given value is a statistic or parameter: The mean age of students at Broward College is 24.7 years.(a)Statistic(b) Parameter 20.Determine which of the four levels of measurement (nominal, ordinal, interval and ratio)is most appropriate for the data below:The social security numbers of students in this class(a)Nominal(b) Ordinal(c) Interval(d) RatioQuestions 21-23, pertain to the statement below:The state of Florida wanted to know what percent of adults over the age of 35, living in Florida, have a gun in their home. They used a Gallup poll in which 2059 randomly selected adults over the age of 35 living in Florida were asked the question “Do you have a gun in your home?” Results showed that 39% answered yes to the question. 21.What is the sample?(a)39% of 2059 randomly selected adults(b) Adults over the age of 35(c)2059 randomly selected adults (d) 2059 randomly selected adults over the age of 3522.What is the population?(a)39% of 2059 randomly selected adults(b) All adults over the age of 35(c)2059 randomly selected adults (d) 2059 randomly selected adults over the age of 3523.The results of the survey revealed that 39% of respondents have a gun in their home. The value of 39% is a ___?(a)Statistic(b) Parameter24.A statistics professor obtains a sample of students by selecting the first 10 students entering his classroom. What type of sampling is he using?(a)Random(b) Systematic(c) Stratified(d) Cluster(e) Convenience25.True or False. The interval level of measurement is like the ordinal level with the additional property that the difference between any two data values is meaningful. Moreover, data at this level have a natural zero starting point. (a)True(b) false 26.Which of the following statements are true?I.All variables can be classified as quantitative or qualitative variables.II.Qualitative variables can be continuous variables.III.Quantitative variables can be discrete variables. (a)I Only(b) I and III Only(c) III Only(d) I and II Only(e) All correct27.Most psychology texts report that the average IQ score for an adult male is between 90 and 110.This average is an example of a:(a)Parameter(b) Sample(c) statistic(d) population(e) None of the above28.The variable that changes due to the manipulation of the independent variable is called the:(a)Explanatory variable(b) outcome variable(c) manipulated variable 29.A sample in which the respondents themselves decide whether to be included is called a:(a)Self-serving (b)voluntary response(c) selection(d)convenience30.What is the level of measurement for academic letter grades such as A, B, C D, F or W? (a)ratio(b) ordinal(c) nominal(d) interval(e)categorical31. Questions 31-33 pertain to the following study: Agricultural researchers are investigating whether a new form of pesticide will lead to lower levels of insect damage to crops than the traditional pesticide. What is the independent variable in this study?(a) Agricultural researchers(b) Type of pesticide used(c) Levels of insect damage to crops(d) Traditional pesticide(e) Amount of crop produced32.What is the dependent variable in this study?(a) Agricultural researchers(b) Type of pesticide used(c) Levels of insect damage to crops(d) Traditional pesticide(e) Amount of crop produced33.Would this be an observational study or an experimental study?(a)Observational (b) ExperimentalQuestions 34 – 38 pertain to the following: Of the adult U.S. population, 36% has an allergy. A sample of 1200 randomly selected adults resulted in 33.2% reporting an allergy.34.What is the population?(a)All adults in the U.S. suffering from allergies(b)All adults in the U.S(c)1200 randomly selected adults(d)36% of the adult population(e)All adults in the U.S. without allergies35.What is the sample?(a)1200 randomly selected adults with allergies(b)All adults in the U.S(c)1200 randomly selected adults(d)36% of the adult population(e)33.2% reporting an allergy36.What is the value of the statistic?(a)1200 randomly selected adults(b)36%(c)33.2%(d)36% of 1200 randomly selected adults(e)33.2% of the adult population37.What is the value of the parameter?(a)33.2%(b)36% (c)1200 randomly selected adults(d)33.2% of the adult population(e)All adults in the U.S population38.Indicate which level of measurement is being used in the scenario below:A professor records the scores that students obtained on their mid-term exam.(a)Nominal(b) Ordinal(c) interval(d) ratio(e) Mid-term exam scores 39.What is another term for a qualitative variable?(a)numerical (b) statistical(c) categorical (d) dependent(e) experimental40.You would like to estimate the percent of students at Broward College who believe that marijuana should be legalized. You get a list of the names and addresses of all students enrolled at the college from the registrar’s office. You send a survey in the mail to all students asking whether they believe that marijuana should be legalized. Identify the problem with this study.(a)The sample is too large(b)The sample is too small(c)The survey has a loaded question(d) It is a voluntary response sample(e) The sample size is not given41.On a test, 74% of the questions are answered correctly. If 111 questions are correct, how many questions are on the test? A) 137 B) 67 C) 150 D) 74E) 8242.A gardener has 75 clients, 45% of whom are businesses. Find the number of business clients. A) 41 clients B) 34 clients C) 36 clients D) 73 clientsE) 60 clients
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