Quiz
Stats Final
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Perguntas do quiz (16)
1Statistics is a process where we do which of the following?
- ACollect data
- BSummarize data
- CInterpret data
- DOptions A and C only
- EAll of the above
2True or False: The Field of Statistics starts when we begin summarizing data.
- AVerdadeiro
- BFalso
3True or False: The statistical term population can only refer to people.
- AVerdadeiro
- BFalso
4What is a sample?
- AIt is a subgroup of the population.
- BIt is a part of the inference step in the Big Picture of Statistics.
- CIt is everyone in the United States.
- DIt is a different term for population.
55. We sometimes hear that marriage is good for your career. A sample of 8235 managers and professionals employed by a specific large manufacturing firm were asked their marital status (married, single, widowed, or divorced) and their annual income. The mean annual income was then calculated for each of the four marital status groups. What is the population?
- AAll managers and professionals employed by this manufacturing firm.
- BThe mean annual income for all managers and professionals employed by this manufacturing firm.
- CThe 8235 managers and professionals who were interviewed.
- DAll married managers and professionals from this large manufacturing firm.
6Referring to the study in question 5, what is the sample?
- AAll managers and professionals employed by this manufacturing firm.
- BThe mean annual income for all managers and professionals employed by this manufacturing firm.
- CThe 8235 managers and professionals from this large manufacturing firm.
- DAll married managers and professionals employed by this manufacturing firm.
7What is the first step in the Big Picture of Statistics?
- AExploratory Data Analysis
- BProducing Data
- CInference
- DProbability
8True or False: Inference is the way that we are allowed to draw conclusions about the population based on the data collected about the sample.
- AVerdadeiro
- BFalso
99. Administrators at Cosmo University are becoming more and more alarmed at the number of hours students work per week. In order to examine the relationship between the number of hours worked per week in a semester and that semester's GPA, one administrator surveyed 300 students currently attending the university. What type of variable is the explanatory variable?
- ACategorical
- BQuantitative
10Referring to the study in question 9, what type of variable is the response variable?
- ACategorical
- BQuantitative
11The following scenario applies to questions 1-3:
A large utility company wants to explore whether they can predict electrical consumption for their residential customers using size of their residence. The manager of the company predicted the electrical consumption for a 2200 square foot residence to be ŷ= 74.4 kilowatts.
Suppose the 95% confidence interval for the mean electrical consumption is (68.7, 80.1). Which of the following is a correct interpretation of this confidence interval?- AWe are 95% confident that the mean electrical consumption of all 2200 square foot residences is between 68.7 kilowatts and 80.1 kilowatts.
- BWe are 95% confident that the electrical consumption of a 2200 square foot residence is between 68.7 kilowatts and 80.1 kilowatts.
- C95% of all 2200 square foot residences have an electrical consumption between 68.7 kilowatts and 80.1 kilowatts.
- DThere is a probability of 0.95 that the mean electrical consumption of all 2200 square foot residences is between 68.7 kilowatts and 80.1 kilowatts.
12Suppose the 95% prediction interval for an individual residence’s electrical consumption is (67.3 , 81.5). Which of the following is a correct interpretation of this prediction interval?
- AWe are 95% confident that the mean electrical consumption of all 2200 square foot residences is between 67.3 kilowatts and 81.5 kilowatts.
- BWe are 95% confident that the electrical consumption of a 2200 square foot residence is between 67.3 kilowatts and 81.5 kilowatts.
- C95% of all 2200 square foot residences have an electrical consumption between 67.3 kilowatts and 81.5 kilowatts.
- DThere is a probability of 0.95 that the mean electrical consumption of all 2200 square foot residences is between 67.3 kilowatts and 81.5 kilowatts.
13When predicting electrical consumption for 2200 square foot residences, one of the following intervals is the 95% confidence interval for the mean electrical consumption; the other is the 95% prediction interval for an individual residence’s electrical consumption. Which is the 95% confidence interval for the mean?
- A(71.5 kilowatts, 77.3 kilowatts)
- B(63.1 kilowatts, 85.7 kilowatts)
14Suppose a 95% confidence interval for the mean tail length of all giant pandas who weigh 110 kilograms is (12.32 cm, 13.88 cm). Which of the following could be the corresponding 95% prediction interval for the tail length of an individual giant panda who weighs 110 kilograms? (Hint: ŷ = 13.1)
- A(11.16 cm, 14.48 cm)
- B(12.57 cm, 13.63 cm)
- C(11.54 cm, 13.10 cm)
- D(11.94 cm, 14.26 cm)
15The following scenario applies to questions 5-7:
A consumer testing service tested whether the average baking time of whole wheat bread in gas ovens was less than the average baking time of whole wheat bread in electric ovens. Ten loaves of whole wheat bread were prepared and five were randomly assigned to be baked in the five randomly selected gas ovens and five were randomly assigned to be baked in the five randomly selected electric ovens.
What is the explanatory variable, and is it quantitative or categorical?- AType of bread which is categorical
- BType of bread which is quantitative
- CType of oven (gas versus electric) which is categorical
- DType of oven (gas versus electric) which is quantitative
- EBaking time which is categorical
- FBaking time which is quantitative
16A consumer testing service tested whether the average baking time of whole wheat bread in gas ovens was less than the average baking time of whole wheat bread in electric ovens. Ten loaves of whole wheat bread were prepared and five were randomly assigned to be baked in the five randomly selected gas ovens and five were randomly assigned to be baked in the five randomly selected electric ovens.
What is the response variable in the above scenario, and is it quantitative or categorical?- AType of bread which is categorical
- BType of bread which is quantitative
- CType of oven (gas versus electric) which is categorical
- DType of oven (gas versus electric) which is quantitative
- EBaking time which is categorical
- FBaking time which is quantitative
Informações
- Descrição
- Quiz sobre Stats Final, criado por Lucy Mack em 20-04-2017.
- Autor
- Lucy Mack
- Idioma
- English
- Visualizações
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