STAT 100 EXAM 2 QUESTIONS AND VERIFIED
ANSWERS; 100% CORRECT; GRADE A
A chi square analysis was performed on the data. With p-value
of 0.262 what conclusion can be made? - correct answer-
Not statistically significant, the conclusion is there we cannot say
there is a relationship between gender and cheating
Fail to reject the null
A group of adults aged 20 to 80 were tested to see how far away
they could first hear an ambulance coming towards them. An
equation describing the relationship between distance (in feet)
and age was found to be:
Distance = 600 - 3 × Age
Based on the equation, what is the direction of the correlation
between distance and age? - correct answer- Negative
The direction of an association can be ascertained by considering
the sign of the slope. Since the slope is negative then so is the
association.
,A group of adults aged 20 to 80 were tested to see how far away
they could first hear an ambulance coming towards them. An
equation describing the relationship between distance (in feet)
and age was found to be:
Distance = 600 - 3 × Age
How much does the predicted distance change when age is
increased by 1? - correct answer- It goes down by 3 feet
The slope gives the increase (or decrease) in the response as X
increases by 1 unit. So if Age (x) increases by 1 year, then
distance (y) decreases, since slope is negative, by 3 feet.
A medical treatment has a success rate of 0.8. Two patients will
be treated with this treatment. Assuming the results are
independent for the two patients, what is the probability that
neither one of them will be successfully cured? - correct
answer- 0.04
Probability of cured is 0.8 so probability of not cured is 0.2.
Independence means multiply so probability that both are not
cured is 0.2*0.2 = 0.04
, A newspaper article reported that "Children who routinely
compete in vigorous after-school sports on smoggy days are
three times more likely to get asthma than their non-athletic
peers." (Sacramento Bee, Feb 1, 2002, p. A1) Of the following,
which is the most important additional information that would
be useful before making a decision about participation in school
sports? - correct answer- What is the baseline risk for
getting asthma?
We would want to know the baseline risk of getting asthma. If
this risk is very low, the 3.5 times something small is still small
(and vice-versa).
A quarter is flipped 2000 times and results in 500 heads. The
25% (500/2000) chance of heads is a - correct answer-
relative frequency probability
A recent college graduate claims he only has a 30% chance of
finding a job in the next two months. The chance of 30% is a -
correct answer- Subjective probability
A regression was done for 20 cities with latitude as the
explanatory variable (x) and average January temperature as the
response variable (y). The latitude is measured in degrees and
average January temperature in degrees Fahrenheit. The
ANSWERS; 100% CORRECT; GRADE A
A chi square analysis was performed on the data. With p-value
of 0.262 what conclusion can be made? - correct answer-
Not statistically significant, the conclusion is there we cannot say
there is a relationship between gender and cheating
Fail to reject the null
A group of adults aged 20 to 80 were tested to see how far away
they could first hear an ambulance coming towards them. An
equation describing the relationship between distance (in feet)
and age was found to be:
Distance = 600 - 3 × Age
Based on the equation, what is the direction of the correlation
between distance and age? - correct answer- Negative
The direction of an association can be ascertained by considering
the sign of the slope. Since the slope is negative then so is the
association.
,A group of adults aged 20 to 80 were tested to see how far away
they could first hear an ambulance coming towards them. An
equation describing the relationship between distance (in feet)
and age was found to be:
Distance = 600 - 3 × Age
How much does the predicted distance change when age is
increased by 1? - correct answer- It goes down by 3 feet
The slope gives the increase (or decrease) in the response as X
increases by 1 unit. So if Age (x) increases by 1 year, then
distance (y) decreases, since slope is negative, by 3 feet.
A medical treatment has a success rate of 0.8. Two patients will
be treated with this treatment. Assuming the results are
independent for the two patients, what is the probability that
neither one of them will be successfully cured? - correct
answer- 0.04
Probability of cured is 0.8 so probability of not cured is 0.2.
Independence means multiply so probability that both are not
cured is 0.2*0.2 = 0.04
, A newspaper article reported that "Children who routinely
compete in vigorous after-school sports on smoggy days are
three times more likely to get asthma than their non-athletic
peers." (Sacramento Bee, Feb 1, 2002, p. A1) Of the following,
which is the most important additional information that would
be useful before making a decision about participation in school
sports? - correct answer- What is the baseline risk for
getting asthma?
We would want to know the baseline risk of getting asthma. If
this risk is very low, the 3.5 times something small is still small
(and vice-versa).
A quarter is flipped 2000 times and results in 500 heads. The
25% (500/2000) chance of heads is a - correct answer-
relative frequency probability
A recent college graduate claims he only has a 30% chance of
finding a job in the next two months. The chance of 30% is a -
correct answer- Subjective probability
A regression was done for 20 cities with latitude as the
explanatory variable (x) and average January temperature as the
response variable (y). The latitude is measured in degrees and
average January temperature in degrees Fahrenheit. The
