A researcher is interested in whether watching an educational program on television has a positive impact on children's grades at school. The researcher records the number of days children watch an educational program over a one-month period and relates it to their grades at school. This study is best described as:Question 13Answera.quasi-experimental.b.correlational.c.experimental.d.a survey.

The amount of television viewed by today's youth is of primary concern to Parents Against Watching Television (PAWT). 300 parents of elementary school-aged children were asked to estimate the number of hours per week that their child watches television. The mean and the standard deviation for their responses were 12 and 2, respectively. PAWT constructed a stem-and-leaf display for the data that showed that the distribution of times was a symmetric, mound-shaped distribution. Give an interval where you believe approximately 95% of the television viewing times fell in the distribution.Group of answer choicesless than 16less than 10 and more than 14 hours per weekbetween 8 and 16 hours per weekbetween 6 and 18 hours per week

Which kind of study can be used to gather information about how the study habits of your classmates  affect their final exam grades?observational studysurveysingle-blind experimentdouble-blind experimentsimple random sample

Studies have shown that adolescents who had viewed educational television as preschoolers had higher grades, read more books, and placed more value on achievement than those who had not watched educational programs as preschoolers. a. True b. False

At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased. Formulate the null and alternative hypotheses for the study described.Question 17Answera.H0: µ = 18.4 ; H1 µ ≠18.4b.H0: µ < 18.4 ; H1 µ > 18.4c.H0: µ = 18.4 ; H1 µ <18.4d.H0: µ > 18.4 ; H1 µ <18.4

Do TV viewers differ, on average, in terms of the amount of television that they watch during the month of January as opposed to June? A researcher conducted a hypothetical study, where the she randomly selected 50 TV viewers and recorded the number of minutes of television watched during January and then again in July. The researcher wanted to determine whether there is a difference in mean number of minutes of television viewing in January and in July.What hypothesis testing technique should the researcher use to analyze the data? Two-sample t-test Paired t-test ANOVA z-test for the population mean