Search why-is-the-standard-deviation-a-better-indicator-of-whether-a-group-of-people-are-the-same-age-or-not

# Why is the standard deviation a better indicator of whether a group of people are the same age or not

## Top Questions

t, instead of the mean, for example?
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Since he became the president, did President Trump act with the transparency and the integrity that you expect from a president?” 675 voters responded the poll and 351 responded “YES.” Assume that 40% of the U.S. population supports Trump. a. Define a binary random variable, Y, for supporting Trump (Y=1) vs. not (Y=0). Calculate the population mean (????????) and variance (???????? 2 ) for supporting Trump. b. Calculate the sample mean ????̅ and the sample standard deviation of ????̅ (????????̅ ) for the poll. c. Calculate the standard error of ????̅ and construct a 95% confidence interval from the poll using ????̅ and its sample standard error. d. Conduct a two-sided hypothesis test at 5% significance level to determine whether 40% of the U.S. population supports Trump. State the null and the alternative hypotheses, calculate the test statistics and the associated p-value, and conclude. Is the Fox News survey reliable? Why? Why Not? e. Suppose that you wanted to design a survey that had a margin of error of at most 1%. That is: the difference between the upper bound and the lower bound of the confidence interval should be a maximum of 2 percentage points. For example, for ????̅ = 0.52 you are aiming for the 95 % CI to be [0.51 0.53]. How large should n be if the survey uses simple random sampling?
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izon problems? In the standard model of cosmology (excepting accelerated expansion) there are three possible fates for the universe. For each fate, state the geometry (shape) of the universe (sphere, saddle, flat), the ulimtate fate of the universe (expand forever, expand forever ever-slowing, big cruch), and how the critical density compares with the actual density of the universe (greater than critical, less than critical, equal to critical). Explain the fates of a low-mass star like the Sun and a high-mass star like Rigel. Make sure to state the final elements produced during their lives and the identity of their ultimate stellar remnants.
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for the universe. For each fate, state the geometry (shape) of the universe (sphere, saddle, flat), the ulimtate fate of the universe (expand forever, expand forever ever-slowing, big cruch), and how the critical density compares with the actual density of the universe (greater than critical, less than critical, equal to critical). Explain the fates of a low-mass star like the Sun and a high-mass star like Rigel. Make sure to state the final elements produced during their lives and the identity of their ultimate stellar remnants. Why is inflation necessary to explain our universe and how does inflation solve the flatness and horizon problems?
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izon problems? Explain the fates of a low-mass star like the Sun and a high-mass star like Rigel. Make sure to state the final elements produced during their lives and the identity of their ultimate stellar remnants. In the standard model of cosmology (excepting accelerated expansion) there are three possible fates for the universe. For each fate, state the geometry (shape) of the universe (sphere, saddle, flat), the ulimtate fate of the universe (expand forever, expand forever ever-slowing, big cruch), and how the critical density compares with the actual density of the universe (greater than critical, less than critical, equal to critical).
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