A teacher gives a third grade class of n = 16 a vocabulary test at the beginning of the school year. To evaluate the changes that occur during the year, students are tested again at the end of the year. Their test scores revealed an average improvement of MD = 5.7 points with sD2 = 144.   a. Is there a significant difference in students’ test scores over the school year? Use an alpha level of .05. b. please compute Cohen’s d and evaluate it.

Joshua went to a doctor's appointment yesterday. He was weighed and the paperwork said that his weight put him in the 35th percentile for weight.  This means that for all [gender] that were weighed at the same [age], [per]% of them weighed [compare] Joshua.   Question options:     [gender] boy     [gender] girls     [gender] all kids     [age] day     [age] week     [age] age     [per] 35     [per] 65     [compare] more than     [compare] less than     [compare] the same as

Suppose that we want to determine if the average amount of timespent online by the students is lessthan 4.5 hours/day. To this end, weconduct a survey of students and askthem how long they spend online perday. We obtain the following results:4.1, 4.3, 4.3, 4.5, 4.6, 4.3, 4.1, 4.6,4.7, 4.6, 4.7, 4.1, 4.3, 4.3, 4.5, 4.6,4.3, 4.1, 4.6, 4.7, 4.6, 4.7, 4.5, 4.6,4.3, 4.1 Assume that the number ofhours spent online has a normal distribution. Test your hypot

A certain affects virus 0.4% of the population (in a population of 100,000 people, 400 will be infected with the virus). A test used to detect the virus in a person is positive 87% of the time if the person has the virus (true positive) and it is positive 14% of the time if the person does not have the virus (false positive). Fill in the remainder of the following table and use it to answer the questions below. Infected Not Infected Total Positive Test Negative Test Total 400 99,600 100,000