Topic
Q:
Which of the following variables is continuous?
Temperature
Age in years
Pick 4 Lottery Combinations
Points scored in an NBA Season
Q:
Practice Problems
1. In 1950, the population of a small suburb in Los Angeles, Califormia, was 20,000 .
The birth rate was measurd at 25 per 1000 population per year, while the death rat
was measured at 7 per 1000 population per year. Immigration was measured at 600
per year while emigration was measured at 200 per year. Calculate the population
size in, 1951 .
2. Calculate the rate of increase for population growth for the preceding problem.
Q:
In 2015 , Netflix subscribers spent an average of 1.55 hours per day streaming content. To deter-
mine if there is an increase in viewing, suppose a new survey was conducted of Netflix subscribers.
Of the 354 people who responded to the survey, an average of 1.58 hours per day were spent
streaming content with a standard deviation of 0.49 hours.
(a) State the hypotheses.
(b) Calculate the test statistic.
(c) Compute the p-value.
(d) Interpret the p-value.
(e) State your conclusion in terms of the problem.
Q:
6. In 2.000 , the world birth rate was 22 births per 1000 people. Whe world death rate
was 9 deaths per 1000 people. Calculate the percent world growth rate.
7. Uganda has a crude birth rate of 48 and a crude death rate of 18.4 . Calculate the
percent population growth rate for Uganda.
Q:
99. A study conducted to examine the age of commercial jets in the United States sampled 36 planes
and found the average age to be 12.6 years with a standard deviation of 2.7 .
(a) Calculate and interpret a \( 90 \% \) confidence interval for the average age of commercial jets in
the United States.
(b) A report in USA Today claimed that the mean age of commercial jets in the United States
was 14 years. Using the confidence interval in (a), is there enough evidence to suggest
the average age is something different than 14 years? Explain.
Q:
En una encuesta realizada entre 180
estudiantes, se encontró que:
- 70 usan Instagram (I)
- 80 usan TikTok (T)
- 90 usan X (X)
- 40 usan Instagram y TikTok
- 30 usan TikTok y X
- 20 usan Instagram y X
- 10 usan las tres redes sociales
¿Cuántos estudiantes usan solo
Instagram?
A. 30
B. 20
C. 110
D. 70
Q:
8. The United States has one of the highest calorie intakes of any country in the world. Suppose a
random sample of 60 residents of the United States had an average daily calorie intake of 3,770
with a standard deviation of 480 .
(a) What is the point estimate for the average calorie intake of Americans?
(b) Find the margin of error for a \( 99 \% \) confidence interval for average calorie intake.
(c) Construct and interpret the \( 99 \% \) confidence interval for the mean calorie intake of American
adults.
Q:
The data set shows the ages of people riding a bus.
What is the mode for this data set?
\[ \begin{array}{lllllllll}18 & 36 & 11 & 45 & 36 & 16 & 19 & 14 & 18\end{array} 36 \]
Q:
What is the median of the data set?
\[ \begin{array}{llllllllll}50 & 52 & 68 & 64 & 65 & 61 & 68 & 75 & 75 & 78\end{array} \]
Q:
What is the mean of the data set rounded to the nearest tenth?
1.1
1.0 .7
1.1
1.3
9.1
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