The American Association of Individual Investors conducts a weekly survey of its members to measure the percentage who are bullish, bearish, and neutral on the stock market for the next six months. For the week ending November 7, 2012, the survey results showed $38.5 \%$ bullish, $21.6 \%$ neutral, and $39.9 \%$ bearish. Consider these results are based on a sample of 300 AAII members.

a. Over the long term, the proportion of bullish AAII members is .39. Conduct a hypothesis test at the $5 \%$ level of significance to see if the current sample results show that bullish sentiment differs from its long-term average of .39. What are your findings?

In the recent Census, three percent of the U.S. population reported being of two or more races. However, the percentage varies tremendously from state to state. Suppose that two random surveys are conducted. In the first random survey, out of 1,000 North Dakotans, only nine people reported being of two or more races. In the second random survey, out of 500 Nevadans, 17 people reported being of two or more races. Conduct a hypothesis test to determine if the population percentages are the same for the two states or if the percent for Nevada is statistically higher than for North Dakota.

At a pre-conceived $\alpha=0.05$, what is your:

Reason for the decision:

Laurel Woods High randomly selected students for a survey to determine the most important school issues among the student body. The school wants to develop a curriculum that addresses these issues. The survey results are shown in the table. 4. a. Find the experimental probability distribution of the importance of each issue.

b. Based on the survey, what is the experimental probability that a student chosen at random thinks the most important issue is grades or school standards?

c. The enrollment in the 9th and 10th grades at Laurel Woods High is 168. If their opinions are reflective of those of the school as a whole, how many of them would you expect to have chosen popularity as the most important issue?

d. Suppose the school develops a curriculum incorporating the top three issues. What is the probability that a student selected at random will think the curriculum addresses the most important issue at school?

The American Association of Individual Investors (AAII) polls its subscribers on a weekly basis to determine the number who are bullish, bearish, or neutral on the short-term prospects for the stock market. Their findings for the week ending March 2, 2006, are consistent with the following sample results (AAII website, March 7, 2006).

$$\text{Bullish} ~~ 409 ~~~~~~~\text{Neutral} ~~ 299~~~~~~~ \text{Bearish}~~ 291$$

Develop a point estimate of the following population parameters.

The proportion of all AAII subscribers who are bullish on the stock market.

An all-news radio station has made a survey of the listening habits of local residents between the hours of 5:00 P.M. and midnight. The survey indicates that the percentage of the local adult population that is tuned in to the station x hours after 5:00 P.M. is $f(x)=\frac{1}{8}\left(-2 x^{3}+27 x^{2}-108 x+240\right).$ a. At what time between 5:00 P.M. and midnight are the most people listening to the station? What percentage of the population is listening at this time? b. At what time between 5:00 P.M. and midnight are the fewest people listening? What percentage of the population is listening at this time?

Choose the letter of the term that best completes each sentence.

a. expert

b. survey

c. adapt

d. remove

e. offset

f. guidelines

g. target

An employment $\underline{\phantom{\text{justekst}}}$ would not include people earning a living through the underground economy.

The results of a national survey showed that on average, adults sleep 6.9 hours per night. Suppose that the standard deviation is 1.2 hours and that the number of hours of sleep follows a bell-shaped distribution.

What is the z-value for an adult who sleeps 6 hours per night?

In a survey of 80 students, 25 said that they planned on attending the pep rally. The school has 550 students. Predict the number of students who plan to attend the pep rally. A. 55 students B. 80 students C. 172 students D. 378 students

In the General Social Survey individuals were asked whether civic duty included voting and whether it included serving on a jury. The results of the survey are shown in the table. Is there a difference in the proportion of individuals who feel jury duty is a civic duty and the proportion of individuals who feel voting is a civic duty? Use the $\alpha$=0.05 level of significance.

$$\begin{matrix} \text{ } & \text{ } & \text{ } & \text{Jury}\\ \text{ } & \text{ } & \text{Duty (success)} & \text{Not Duty (failure}\\ \text{Voting} & \text{Duty (success)} & \text{1322} & \text{65}\\ \text{ } & \text{Not duty (failure)} & \text{45} & \text{17}\\ \end{matrix}$$

A survey asked 295 males and females whether they preferred reading about the news from a newspaper or on the Internet. Of the 138 males, 97 said that they preferred the Internet. Of the 157 females, 32 said that they preferred a newspaper. Make a two-way frequency table for the data.

In late 2006, the Pew Internet and American Life Project conducted a telephone survey of 935 adults and their children aged 12 to 17. One question they asked was "Do you, personally, happen to have ... a desktop computer? A cell phone? An iPod or other MP3 player? A laptop computer? A PDA like a Palm Pilot or Blackberry?" The table below summarizes the responses.

$$\begin{matrix} \text{} & \text{Desktop } & \text{Cell phone } & \text{iPod/MP3} & \text{Laptop} & \text{PDA}\\ \text{Parent and teen both own one} & \text{64\\\%} & \text{60\\\%} & \text{22\\\%} & \text{18\\\%} & \text{1\\\%}\\ \text{Parent owns one, teen doesn't} & \text{19\\\%} & \text{29\\\%} & \text{7\\\%} & \text{19\\\%} & \text{12\\\%}\\ \text{Teen owns one, parent doesn't} & \text{8\\\%} & \text{3\\\%} & \text{29\\\%} & \text{7\\\%} & \text{7\\\%}\\ \text{Neither parent nor teen owns one} & \text{9\\\%} & \text{8\\\%} & \text{42\\\%} & \text{56\\\%} & \text{80\\\%}\\ \end{matrix}$$

Make a bar graph comparing teens ' and parents' ownership of these devices.

Take an informal survey involving two or three of your classmates. Be sure to use que in your answer.

MODELO la clase/te gusta más La clase que me gusta más es el español.

el estado/quieres visitar

The American Association of Individual Investors (AAII) polls its subscribers on a weekly basis to determine the number who are bullish, bearish, or neutral on the short-term prospects for the stock market. Their findings for the week ending March 2, 2006, are consistent with the following sample results (AAII website, March 7, 2006).

$$\text{Bullish} ~~ 409 ~~~~~~~\text{Neutral} ~~ 299~~~~~~~ \text{Bearish}~~ 291$$

Develop a point estimate of the following population parameters.

The proportion of all AAII subscribers who are bearish on the stock market.

The Eco Pulse survey from the marketing communications firm Shelton Group asked individuals to indicate things they do that make them feel guilty (Los Angeles Times, August 15, 2012). Based on the survey results, there is a $.39$ probability that a randomly selected person will feel guilty about wasting food and a $.27$ probability that a randomly selected person will feel guilty about leaving lights on when not in a room. Moreover, there is a $.12$ probability that a randomly selected person will feel guilty for both of these reasons.

a. What is the probability that a randomly selected person will feel guilty for either wasting food or leaving lights on when not in a room?