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##### stats data bank-Which of the following is most likely a population as opposed to a sample?

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Question;1.;Which of the following is most likely a population as opposed to;a sample?;Answer;respondents;to a newspaper survey;the;first 5 students completing an assignment;every;third person to arrive at the bank;registered;voters in a county;4 points;Question 2;1.;Which of the following can be reduced by proper interviewer;training;Answer;sampling;error;measurement;error;both;of the above;none;of the above;4 points;Question 3;1.;According to the empirical rule, if the data form a;bell-shaped" normal distribution, ________ percent of the;observation will be contained within 1 (one) standard deviation around the;arithmetic mean.;Answer;68.26;75.00;88.89;93.75;4 points;Question 4;1.;The probability that a new advertising campaign will increase;sales is asssessed as being 0.80. The probabliity that the cost of;devolping the new add campaign can be kept within the original budget;allocation is 0.40. Assuming that the two events are independent, the;probability that the cost is kept withing budget and the campain will increase;sales is;Answer;0.20;0.32;0.40;0.88;4 points;Question 5;1.;In a non symmmetrical distribution;Answer;the;range equals the interquartile range;the;interquartile range equals the mean;the;median does not equal the mean;the;variance equals the standard deviation;4 points;Question 6;1.;Which statement about the standard normal distribution is NOT;true;Answer;It;has a mean of 0;It;has a variance of 0;has;an area under the probability distribution curve equal to 1.;has;a standard deviation of 1.;4 points;Question 7;1.;If we know that the length of time it takes a college student to;find a parking spot in the library parking lot follows a normal distribution;with a mean of 4.5 minutes and a standard deviation of 3.2 minute, find the;probability that a randomly selected college student will find a parking spot;in the library parking lot in less than 4 minutes.;Answer;0.4379;0.5000;0.5620;0.9999;4 points;Question 8;1.;The following data represent the response (Y for yes and N for;no) from a sample of 40 college students to the question SDo you currently own;shares in any stocks? (8 points)N N Y N N N N Y N Y N N Y N Y Y N N N YN Y N N;N N Y N N N Y N N N Y N N Y N NWhat is the standard error of the sample;proportion of college students who own stocks?;Answer;0.0114;0.0724;0.4582;2.8982;4 points;Question 9;1.;If an economist wishes to determine whether there is evidence;that average family income in a community exceeds $25,000;Answer;either;a one-tailed or two-tailed test could be used with equivalint results.;a;one tailed test should be utilized.;a;two-tailed test shoud be utilized.;none;of the above.;4 points;Question 10;1.;The power of a;statistical test is;Answer;the;probability of not rejecting Ho when it is false.;the;probability of rejecting Ho when it is true.;the;probablility of not rejecting Ho when it is true.;the;proability of rejecting Ho when it is false.;4 points;Question 11;1.;If we are testing for the difference between the means of 2;related populations with samples of n1 = 20 and n2 = 20, the number of degrees;of freedom is equal to;Answer;39;38;19;18;4 points;Question 12;1.;The statictical distribution used for testing the difference;between two population variances is the ___ distribution.;Answer;t;standardized;normal;binomial;F;4 points;Question 13;1.;a "robust" test procedure is one which;Answer;requires;a sofphisticaed level of measurement.;requires;a semi-circular shaped population.;is;sensetive to slight violations in its assumptions.;is;insensetive to slight violations in its assumptions.;4 points;Question 14;1.;Why would you use the Tukey-Kramer procedure?;Answer;to;test for normality;to;test for homogeneity of variance;to;test for independence of errors;to;test for the differences in pairwise means;4 points;Question 15;1.;For a given level of significance, if the sample size is;increased, the power of the test will;Answer;increase;stay;the same;decrease;4 points;Question 16;1.;The standard error of the sample proportion is the largest when;the sample proportion reaches;Answer;0.9;0.8;1;0.5;4 points;Question 17;1.;An economist is interested in studying the incomes of consumers;in a particular region. The population standard deviation is know to be;$1,000. A random sample of 50 individuals resulted in an average income;of $15,000. What sample size would the economist need to use if he;wants a 95% confidence interval no wider than plus or minus $100?;Answer;1486;individuals;385;individuals;126;individuals;85;individuals;4 points;Question 18;1.;A 99% confidence intereval estimate can be interpreted to mean;that;Answer;if;all possible samples are taken and confidence interval estimates are;developed, 99% of them would include the true population mean somewhere;within their interval.;we;have 99% confidence that we have selected a sample whose interval does;include the population mean.;both;of the above;none;of the above;4 points;Question 19;1.;The Y intercept (bo) represnts the;Answer;the;predicted value of Y when X = 0.;the;change in estimated average y per unit change in X.;predicted;value of Y.;variation;around the sample regression line.;4 points;Question 20;1.;The slope (b1) represents;Answer;the;predictied value of Y when X = 0;the;estimated average change in Y per unit change in X.;the;predicted value of Y.;variation;around the line of regression.;4 points;Question 21;1.;The least squares method minimizes which of the following?;Answer;SSR;SSE;SST;all;the above;4 points;Question 22;1.;In performing a regression analysis involving two numerical;variables, we are ssuming;Answer;the;variances of X and Y are equal.;the;variation around the line of regression is the same for each X value.;that;X and Y are independent.;all;of the above.;4 points;Question 23;1.;The strength of the linear relationship between to numerical;variables may be measured by the;Answer;scatter;diagram;coefficient;of correlation;slope;Y;intercept;4 points;Question 24;1.;In a multiple regression mode, the value of the coefficient of;multiple determination;Answer;has;to fall between -1 and +1.;has;to fall between 0 and +1.;has;to fall between -1 and 0.;can;falll between any pair of real numbers.;4 points;Question 25;1.;When testing for independence in a contingency table with 3 rows;and 4 columns, there are ______ degrees of freedom.;Answer;5;6;7;12

Paper#62396 | Written in 18-Jul-2015

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