Topic
Q:
Consider the Standard Normal distribution.
The mean is always
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Q:
A variable is normally distributed with mean 18 and standard deviation 9. Use yōur graphing calculator to
find each of the following areas. Write your answers in decimal form. Round to the nearest thousandth as
needed.
a) Find the area to the left of 17.
b) Find the area to the left of 12 .
c) Find the area to the right of 13.
d) Find the area to the right of 26 .
e) Find the area between 12 and 29 .
Q:
Practice Test
65358 - Guerrero, Faustino B - Math Models - Semester A / Unit 2 - Geometry, Probability and:
13. Choose the correct answer.
A random sample of 15 states is selected to find the average population in the United States.
Is this sampling method biased?
Q:
4. Find the mean, median, mode, and range using the data below.
\[ \{77,73,92,94,94,89,92,89,68,89\} \]
Mean:
Median:
Mode:
Range:
Q:
Question 13
In a normal distribution, a data value located 1.4 standard deviations below the mean has Standard Score:
\( \mathrm{z}=\square \)
\( \mathrm{z}=\square \)
In a normal distribution, a data value located 2.3 standard deviations above the mean has Standard Score:
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A set of exam scores is normally distributed with a mean \( =82 \) and standard deviation \( =7 \).
Use the Empirical Rule to complete the following sentences.
\( 68 \% \) of the scores are between \( \square \) and
\( 95 \% \) of the scores are between
Q:
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A set of exam scores is normally distributed with a mean \( =82 \) and standard deviation = 7 .
Use the Empirical Rule to complete the following sentences.
\( 68 \% \) of the scores are between \( \square \) and
\( 95 \% \) of the scores are between \( \square \) and
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Se realizó una encuesta a 40 personas, para saber cuál
libro era su preferido, los resultados que obtuvieron
fueron los siguientes \( \frac{1}{5} \) dijeron "El principito" \( \frac{2}{5} \) "Alicia
en el país de las maravillas" \( \frac{1}{4} \) "El Cuervo" y el resto
dijeron "Rayuela". ¿Qué fracción corresponde a los que
dijeron que su libro preferido es "Rayuela"?
Q:
Which of the following statements are TRUE about the Normal Distribution? Check all that apply.
about \( 95 \% \) of all data values lie within 1 standard deviation of the mean.
The distribution is symmetric with a single peak.
The graph of the Normal Distribution is bell-shaped, with tapering tails that never actually touch
the horizontal axis.
Data values are spread evenly around the mean.
The mean, median and mode are all equal and occur at the center of the distribution.
Data values farther from the mean are less common than data values closer to the mean.
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Q:
If a \( z \)-score is zero, which of the following must be true? Explain your reasoning.
- The mean is zero.
- The corresponding \( x \)-value is zero.
A. The corresponding \( x \)-value is equal to the mean.
divided by the standard deviation.
B. The mean is zero, because the mean is always equal to the \( z \)-score.
C. The corresponding \( x \)-value is zero, because the \( z \)-score is equal to the \( x \)-value divided by the standard deviation.
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