Tema
Q:
A personality test has a subsection designed to assess the "honesty" of the test-tak
subsection among the general population. You decide that you'll use the mean of a
What is the minimum sample size needed in order for you to be \( 95 \% \) confident tha
population standard deviation of scores on this subsection.
Carry your intermediate computations to at least three decimal places. Write your
minimum whole number that satisfies the requirements).
(If necessary, consult a list of formulas.)
Q:
El censo de población realizado en México en 1910 informó que la población era de 15.2 millones. Cuando se
realizó el censo once anos después, en 1921 , la población era de 14.3 millones de habitantes. ¿Cuánto varió la
ooblación en esos once años? ¿A qué consideras que se debió este fenómeno poblacional?
Q:
The US Department of Energy reported that \( 49 \% \) of homes were heated by natural gas. A random sample of
304 homes in Oregon found that 155 were heated by natural gas. Test the claim that proportion of homes
in Oregon that were heated by natural gas is different than what was reported. Use a \( 5 \% \) significance
level. Give answer to at least 4 decimal places.
Q:
Number of Words in a Novel The National Novel Writing Association states that the average novel is at least 50,000 words. A particularly ambitious writing
club at a college-preparatory high school had randomly selected members with works of the following lengths. At \( \alpha=0.01 \), is there sufficient evidence to
conclude that the mean length is greater than 50,000 words? Assume that the population is approximately normally distributed.
\( 52,898 \quad 51,714 \quad 51,967 \quad 51,992 \quad 50,079 \quad 51,487 \quad 50,844 \)
Send data to Excel
Q:
Question 5
If \( n-28, \bar{x}(x \)-bar \( )=39 \), and \( s=6 \), construct a confidence interval at a \( 80 \% \) confidence level. Assume the data
came from a normally distributed population.
Give your answers to one decimal place.
Q:
5. Durante las semanas \( 1,2,3 \) y 4 del lanzamiento de un celular de moda, se venden: \( 1.8,3.2,4.2 \) y 4.8 millones
de plezas respectivamente.
a) ¿Sería útil para la empresa tener una fórmula que proporclone el número de celulares que se venden en
cierta semana?
Q:
Question 4
You want to obtain a sample to estimate a population mean age of the incoming fall term transfer
students. Based on previous evidence, you believe the population standard deviation is approximately
\( \sigma=7 \). You would like to be \( 95 \% \) confident that your estimate is within 1.6 of the true population mean.
How large of a sample size is required?
Do not round between steps. Use technology to find z-score. Give your answer in whole people. Make sure
you use the correct rounding rule for samples size.
, Next Questions
Q:
You want to obtain a sample to estimate the proportion of a population that possess a particular genetic
marker. Based on previous evidence, you believe approximately \( p^{*}=84 \% \) of the population have the
genetic marker. You would like to be \( 98 \% \) confident that your estimate is within \( 4 \% \) of the true population
proportion. How large of a sample size is required?
Do not round mid-calculation. However, you may use a critical value accurate to three decimal places.
Next Question
Q:
Suppose you flip two coins 100 times. The results are 40 both heads,
37 one head one tail, and 23 both fails. Are the coins fair? Test at a
\( 5 \% \) significance level.
Q:
Assume that a sample is used to estimate a population proportion p. Find the \( 98 \% \) confidence interval for a
sample of size 228 with \( 75.9 \% \) successes. Enter your answer as an open-interval (i.e., parentheses) using
decimals (not percents) accurate to three decimal places.
\( 98 \% \) C.I. -
Answer should be obtained without any preliminary rounding. However, the critical value may be rounded
to 3 decimal places.
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