Exam 12: Inference About a Population

Marketing segmentation separates consumers of a product into different groups in such a way that members of each group are ____________________ and there are differences between ____________________.

When determining the sample size needed for a proportion for a given level of confidence and sampling error,the closer to 0.50 that p is estimated to be:

The use of the standard normal distribution for constructing confidence interval estimate for the population proportion p requires:

Energy Drink Consumption A researcher at the University of Washington medical school believes that energy drink consumption may increase heart rate.Suppose it is known that heart rate (in beats per minute)is normally distributed with an average of 70 bpm for adults.A random sample of 25 adults was selected and it was found that their average heartbeat was 73 bpm after energy drink consumption,with a standard deviation of 7 bpm. ​ ​ -{Energy Drink Consumption Narrative} Formulate the null and alternative hypotheses.

The degrees of freedom for the test statistic for μ when σ is unknown is:

Healthy Foods In segmenting the frozen meal market in Spain,a food manufacturer uses health and diet consciousness as the segmentation variable.Four segments are developed and coded as follows: 1: Concerned about eating healthy foods 2: Concerned about weight 3: Concerned about health because of illness 4: Unconcerned To distinguish between groups,surveys are conducted.On the basis of a questionnaire,people are categorized as belonging to one of these groups.A recent survey asked a random sample of 1,500 Spanish adults (20 and over)to complete the survey.Out of the 1,500 people surveyed,360 indicated that they are concerned about eating healthy foods.The most recent information available reveals that there are 40,256,000 Spanish adults who are 20 and over. ​ ​ -{Healthy Foods Narrative} What is the point estimate of the proportion p of Spanish adults who classify themselves as concerned about eating healthy?

The test statistic used to test hypotheses about the population variance has a chi-squared distribution with ____________________ degrees of freedom.

Target marketing focuses on satisfying the demands of all segments of the entire market.

A robust estimator is one that is:

The width of a confidence interval estimate for a proportion will be:

A random sample of size 18 taken from a normally distributed population revealed a sample mean of 100 and a sample variance of 49.The 95% confidence interval for the population mean would equal:

Pilots' Union Contract A union composed of several thousand pilots is preparing to vote on a new contract.A random sample of 500 pilots yielded 320 who planned to vote yes.It is believed that the new contract will receive more than 60% yes votes. ​ ​ -{Pilots' Union Contract Narrative} Can we infer at the 5% significance level that the new contract will receive more than 60% yes votes?

The lower limit of the 90% confidence interval for the population proportion p,given that n = 400 and = 0.10,is 0.0247.