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Homework answers / question archive / QUESTION 1 Source | SS df MS Number of obs = 1,354 -------------+---------------------------------- F(1, 1352) = 75

QUESTION 1 Source | SS df MS Number of obs = 1,354 -------------+---------------------------------- F(1, 1352) = 75.43 Model | 4.1802e+11 1 4.1802e+11 Prob > F = 0.0000 Residual | 7.4927e+12 1,352 5.5419e+09 Rsquared = 0.0528 -------------+---------------------------------- Adj R-squared = 0.0521 Total | 7.9107e+12 1,353 5.8468e+09 Root MSE = 74444 -----------------------------------------------------------------------------worker_inc~e | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------age | 1117.816 128.7078 8.68 0.000 865.3271 1370.304 _cons | 6151.854 5898.336 1.04 0.297 5419.031 17722.74 -----------------------------------------------------------------------------The dependent variable in this regression, worker_income, is annual salary. Using this regression output, predict the income of some who is 30 years old. QUESTION 2 A regression model between sales (y in $1,000), unit price (x1 in dollars) and television advertisement (x2 in dollars) resulted in the following function: y = 7 – 3x1 + 5x2 The coefficient of the unit price indicates that if the unit price is decreased by $1 (holding advertising constant), sales are expected to decrease by $3 increased by $1 (holding advertising constant), sales are expected to decrease by $3,000 increased by $1 (holding advertising constant), sales are expected to increase by $4,000 increased by $1 (holding advertising constant), sales are expected to increase by $3 QUESTION 3 A new phone game requires users to pay a fee to access special features. This chart shows the share of downloads and the amount of money they spend. 98% $ - 1% $ 10.00 0.50% $ 100.00 0.50% $1,000.00 How much does the average new user spend? Put the answer in dollars in the box below; do not include the dollar $ign. QUESTION 4 A p-value is the probability corresponding to the critical value(s) in a hypothesis test. probability, when the null hypothesis is true, of obtaining a sample result that is at least as unlikely as what is observed probability of a Type II error value of the test statistic QUESTION 5 Determine the area under the standard normal (z) curve to the right of nearest hundredth (0.01) or copy and paste from Excel. –0.91. Answer to at least the QUESTION 6 The value which has half of the observations above it and half the observations below it is called the median range mode mean QUESTION 7 The Centers for Disease Control (CDC) has found that 40% of people with the flu miss more than a week of work, and that this follows a binomial distribution. What is the probability that in a sample of 8 workers that have the flu that less than 3 of them will miss more than a week of work? Use technology to answer this question, and round to 4 decimal places. QUESTION 8 The average time to download Avengers: Endgame from the Apple website is 456.59 seconds with a standard deviation of 100.66 seconds. Assume that the time to download the movie follows a normal distribution. You think you have a slow internet connection, and think only 7% of users have a slower download time than you do. How long should it take to download Avengers: Endgame if only 7% of downloads take longer than your time? Use technology to answer this question, and give at least 2 decimal places in your answer. QUESTION 9 Source | SS df MS Number of obs = 1,354 -------------+---------------------------------- F(1, 1352) = 75.43 Model | 4.1802e+11 1 4.1802e+11 Prob > F = 0.0000 Residual | 7.4927e+12 1,352 5.5419e+09 R-squared = 0.0528 -------------+---------------------------------- Adj R-squared = 0.0521 Total | 7.9107e+12 1,353 5.8468e+09 Root MSE = 74444 -----------------------------------------------------------------------------worker_inc~e | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------age | 1117.816 128.7078 8.68 0.000 865.3271 1370.304 _cons | 6151.854 5898.336 1.04 0.297 -5419.031 17722.74 -----------------------------------------------------------------------------What percent of the variation in the dependent variable, worker income, is explained by the independent variables in this regression? Enter the result as a decimal. For example, if the share of variance explained is enter 12.34%, enter 0.1234. QUESTION 10 Pokemon Go encourages its players to get out and walk, and they wish to understand how many kilometers Pokemon Go trainers walk per week. They take a survey of 196 Pokemon Go trainers and find the average distance that a trainer walks per week of 36.79 kilometers. From previous research, they know that the standard deviation for amount a person walks per week is 24.81 kilometers. Using technology, find the lower bound for the 99% confidence interval estimate for the number of kilometers a Pokemon Go trainer walks per week. Answer with at least 2 decimal places. QUESTION 11 A researcher has collected the following sample data. The mean of the sample is 10. 5 18 1 19 11 6 The standard deviation is 2.99 60 8.5 7.32 QUESTION 12 If the correlation between two variables is negative, that means the two variables do not have a strong relationship as one goes up the other tends to go down the relationship between the variables decreases over time one variable has more variance than the other QUESTION 13 According to the Empirical Rule, under certain circumstances we know that at least this much of the data are within two standard deviations of the mean. 68% 75% 95% 99.7% QUESTION 15 Trials by jury in the United States can be considered a form of a hypothesis test. In a trial, the null hypothesis is that a person did not commit a crime. On the other hand, the alternative hypothesis is that the person actually committed the crime. In the American legal justice system, the bigger mistake in a trial is to find a person guilty, who is in actual fact innnocent of the crime. What type of error has a jury committed if they find an innocent person guilty of a crime? Type I Error Type II Error Legal Error Reversible Error QUESTION 16 Data collected at the same, or approximately the same, point in time are cross-sectional data approximate data approximate time series data time series data

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