Che is tracking young participants over a 1-year period in a study on extroversion. In her baseline survey, 35% of the sample report being extremely extroverted. However, when Che observes the participants at school, fewer than 10% demonstrate behaviors such as engaging in conversation with strangers, attempting to make new friends, or expressing themselves freely.With what type of validity may Che’s measure have a problem?

ndrés is interested in testing a new measure of extroversion in college students. He gives the measure to a group of 20 college students and then administers it again 3 and 6 months later. He finds that some of the students who initially reported moderate levels of extroversion report lower levels 6 months later, while several of the students who initially reported low levels of extroversion report higher levels 6 months later.With what type of reliability may Andrés’ measure have a problem?

According to Facebook’s self-reported statistics, the average Facebook user is connected to 80 community pages, groups, and events. For a statistics project, a student at Contra Costa College tests the hypothesis that CCC students will average less than 80 such connections.She posts a survey on her Facebook page. Her sample contains 45 responses.She chooses a 5% level of significance. From her data she calculates a t-test statistic of approximately −1.74 with a P-value of about 0.04.What can she conclude? The data is not statistically significant. In other words, the data do not provide enough evidence to conclude that the mean number of Facebook connections to community pages, groups and events of all CCC college students is less the 80. Nothing. The conditions for use of a t-test are not met. She cannot trust that the P-value is accurate for this reason. The data is statistically significant. In other words, the data do provide enough evidence to conclude that the mean number of Facebook connections to community pages, groups and events of all all CCC college students is less the 80.

Page(s) 56–593.1. VariablesResearchers want to know whether the age at which people begin using a cell phone is associated with their level of extroversion. The researchers will examine the number of people that participants interact with in a day.Which of the following words describe “extroversion” in the context of this study?Describing “Extroversion”Drag appropriate answer(s) hereconceptualconstantmeasuredmanipulatedoperationalvariableNot Describing “Extroversion”Drag appropriate answer(s) here

According to Facebook’s self-reported statistics, the average Facebook user is connected to 80 community pages, groups, and events. For a statistics project, a student at Contra Costa College tests the hypothesis that CCC students will average less than 80 such connections.She posts a survey on her Facebook page. Her sample contains 45 responses.She chooses a 5% level of significance. From her data she calculates a t-test statistic of approximately −1.74 with a P-value of about 0.04.What can she conclude? Nothing. The conditions for use of a t-test are not met. She cannot trust that the P-value is accurate for this reason. The data is statistically significant. In other words, the data do provide enough evidence to conclude that the mean number of Facebook connections to community pages, groups and events of all all CCC college students is less the 80. The data is not statistically significant. In other words, the data do not provide enough evidence to conclude that the mean number of Facebook connections to community pages, groups and events of all CCC college students is less the 80.

4(e) Based on the design of the study and the p-value reported (using a 5% level of significance), a claim can? Can not? be made for these undergraduate students that 'the type of facial expression causes a change in trustworthiness ratings'.