21⟩ people over 30?
* a) 2.5
* b) 0.4
* c) 0.5
* d) 30%
Answer - a
Statics
Home Education and Science Statics
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32 Statics Questions And Answers
22⟩ The newspaper also reported, The number of children in the study who contracted asthma was relatively small Answer - 265 of 3,535. From this information and the information given in the original quote, which of the following could not be computed?
* a) The baseline risk of getting asthma without participating in after-school sports
* b) The overall risk of getting asthma for the children in this study
* c) The relative risk of getting asthma for children who routinely participate in vigorous after-school sports on smoggy days and their non-athletic peers.
* d) All of the above could be computed
Answer - a
23⟩ Among people with age under 30 what are the odds that they always exceed the speed limit?
* a) 1 to 2
* b) 2 to 1
* c) 1 to 1
* d) 50%
Answer - c
24⟩ Scenario A survey asked people how often they exceed speed limits. The data are then categorized into the following contingency table of counts showing the relationship between age group and response. Exceed Limit if Possible Age Always Not Always Total Under 30 100 100 200 Over 30 40 160 200 Total 140 260 400 Among people with age over 30, what is the risk of always exceeding the speed limit?
* a) 0.20
* b) 0.40
* c) 0.33
* d) 0.50
Answer - a
25⟩ Past data has shown that the regression line relating the final exam score and the midterm exam score for students who take statistics from a certain professor is Final exam = 50 + 0.5 × midterm. One interpretation of the slope is?
* a) A student who scored 0 on the midterm would be predicted to score 50 on the final exam.
* b) A student who scored 0 on the final exam would be predicted to score 50 on the mid term exam
* c) A student who scored 10 points higher than another student on the midterm would be predicted to score 5 points higher than the other student, did on the final exam
* d) Students only receive half as much credit (.5) for a correct answer on the final exam compared to a correct answer on the midterm exam
Answer - c
26⟩ If value of x for normal distribution is 35, mean of normal distribution is 65 and standard deviation is 25 then standardized random variable is?
27⟩ In set theory, the universe of discourse is called the?
Universal set
28⟩ Homogenieity of variance refers to what?
29⟩ Simpsons Paradox occurs when?
* a) No baseline risk is given, so it is not know whether a a high relative risk has practical importance
* b) High relative risk has practical importance
* b) A confounding variable rather than the explanatory variable is responsible for a change in the response variable.
* c) The direction of the relationship between two variables changes when the categories of a confounding variable are taken into account.
* d) The results of a test are statistically significant but are really due to chance.
Answer - c
30⟩ A chi-square test involves a set of counts called “expected counts.” What are the expected counts?
* a) Hypothetical counts that would occur of the alternative hypothesis were true.
* b) Hypothetical counts that would occur if the null hypothesis were true
* c) The actual counts that did occur in the observed data
* d) The long-run counts that would be expected if the observed counts are representative.
Answer - b
31⟩ Pick the choice that best completes the following sentence. If a relationship between two variables is called statistically significant, it means the investigators think the variables are?
* a) Related in the population represented by the sample.
* b) Not related in the population represented by the sample
* c) Related in the sample due to chance alone
* d) Very important
Answer - a
32⟩ A chi-square test of the relationship between personal perception of emotional health and marital status led to rejection of the null hypothesis, indicating that there is a relationship between these two variables. One conclusion that can be drawn is?
* a) Marriage leads to better emotional health.
* b) Better emotional health leads to marriage.
* c) The more emotionally healthy someone is, the more likely are they to be married
* d) There are likely to be confounding variables related to both emotional health and marital status
Answer - d
