Tema
Q:
According to a report, \( 66.5 \% \) of murders are committed with a firearm.
(a) If 400 murders are randomly selected, how many would we expect to be committed with a firearm?
(b) Would it be unusual to observe 287 murders by firearm in a random sample of 400 murders? Why?
(a) We would expect \( \square \) to be committed with a firearm.
Q:
2 Homework
\( \leqslant \quad \) According to a report, \( 62.5 \% \) of murders are committed with a firearm.
(a) if 200 murders are randomly selected, how many would we expect to be committed with a firearm?
(b) Would it be unusual to observe 131 murders by firearm in a random sample of 200 murders? Why?
(a) We would expect \( \square \) to be committed with a firearm.
Q:
In a survey, it was found that \( 60 \% \) of adults operate the flusher of toilets in public restrooms with their foot.
(a) If 500 adults are randomly selected, how many would we expect to fush toilets in public restrooms with their foot?
(b) Would it be unusual to observe 450 adults who flush toilets in public restrooms with their foot?
(a) We would expect \( \square \) adults to flush toilets in public restrooms with their foot.
(Type a whole number.)
Q:
In a survey, it was found that \( 72 \% \) of adults operate the flusher of toilets in public restrooms with their foot.
(a) If 300 adults are randomly selected, how many would we expect to flush toilets in public restrooms with their foot?
(b) Would it be unusual to observe 240 adults who flush toilets in public restrooms with their foot?
(a) We would expect \( \square \) adults to flush toilets in public restrooms with their foot.
(Type a whole number.)
Q:
a. Using an interval of 10 g , organise the mango fruit weight data into intervals of 10 g to form a summary of grouped data. Include the frequency
and relative frequency of the classes.
b. Draw a histogram plot of the grouped data in (a) and
c. Describe the distribution of the mango fruit weight as the yield of production
TION 2
Q:
Ang and Lisa each took four quizzes which were worth 10 points per quiz. Their scores
were \( 5,6,7,8,9,9,10 \), and 10 . (Note; the two girls' scores are mixed together in this
list - the scores are not separated by student.) If the mean of Lisa's scores was 7.5 , then
what was the mean of Ang's scores?
Q:
Assume that the amounts of weight that male college students gain during their freshman year are
normally distributed with a mean of \( \mu=1.4 \mathrm{~kg} \) and a standard deviation of \( \sigma=5.3 \mathrm{~kg} \). Complete parts (a)
through (c) below.
a. If 1 male college student is randomly selected, find the probability that he gains between 0 kg and 3 kg
during freshman year.
The probability is 0.2228 .
(Round to four decimal places as needed.)
b. If 16 male college students are randomly selected, find the probability that their mean weight gain
during freshman year is between 0 kg and 3 kg .
The probability is
Q:
A student was asked to find a \( 95 \% \) confidence interval for the proportion of students who take notes using
data from a random sample of size \( n=88 \). Which of the following is a correct interpretation of the interval
\( 0.11<p<0.25 \) ?
Q:
A 2011 Gallup survey based on telephone and face-to-face interviews with 4,220 adults in China, aged 15
and older suggests that \( 30 \% \) smoke regularly or occasionally. The following is also noted "one can say with
\( 95 \% \) confidence that the maximum margin of sampling error is 2.3 percentage points". Which of the
following is true based on the results of this survey?
Exactly \( 30 \% \) of all Chinese adults smoke.
Q:
Out of a sample of 300 adults aged 18 to 30,90 still lived with their parents. Based on this, construct a \( 99 \% \)
confidence interval for the true population proportion of adults ages 18 to 30 that still live with their
parents.
Give your answers rounded to 4 decimal places.
Enter an interer or decimal number [more..1
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