Indicate whether the following study is an observational study or a controlled experiment.   A researcher is interested in the effect of music on memory. She randomly divides a group of students into three​ groups: those who will listen to quiet​ music, those who will listen to loud​ music, and those who will not listen to music. After the appropriate music is played​ (or not​ played), she gives all the students a memory test.       Question content area bottom Part 1 Select the correct answer below.     A. This is a controlled experiment. She assigns students to the control and treatment groups at random in order to control for all relevant factors aside from the effect of music on​ memory, which is essential to conducting a controlled experiment.   B. This is an observational study. The number of treatment groups is not sufficiently large to control for all relevant factors aside from the effect of music on​ memory; a large number of treatment groups is essential to conducting a controlled experiment.   C. This is a controlled experiment. She controls for other factors prior to assigning students to the control group and two treatment groups. This is essential to conducting a controlled experiment.   D. This is an observational study. The researcher observes only the results of the memory test. Without observing the​ subjects' performance on memory tests prior to assignment to different​ groups, the study is not sufficiently active to make this a controlled experiment.

The number of mistakes made on a typing test is Normally distributed. Five office employees---Kelly, Meredith, Stanley, Oscar, and Toby---each take this typing test and record the number of mistakes they make. In the table below, the corresponding zz-score is given for each individual. Based on this information, which worker made the least mistakes on the typed test and therefore performed best? z scores kelly 2.2 mary  -0.4 stanley -1.8 oscar 1.0 toby 0

A psychologist at a private mental health facility was asked to determine whether there was a clear difference in the length of stay for patients with different categories of diagnosis. Looking at the last seven patients in each of the three major categories, the results (in terms of weeks of stay) were as follows. Using the data below, test whether the length of stay for patients vary based on category of diagnosis.  Diagnosis Category  Affective Disorders  Cognitive Disorders  Drug-related Conditions  7 12 8 6 8 10 5 9 12 6 11 10 9 11 9 5 10 11 6 9 12 The above scenario requires a one-way Anova, with a bar graph. Question - I need to write an explanation for the output given. I am to include a statistical notation and explanation as to whether the results are significant or not significant.  Examples of Explanation: Non-significant:A One-Way ANOVA was conducted to examine whether a preceding situation (watching a…

Drop down options are as follows: a. z test or t test b. u or p, <,>,= or not equal to c. z or t

Many students at Matt's school claim they can think more clearly while listening to their favorite kind of music. Matt thinks music interferes with thinking clearly. To test this, he recruits 84 volunteers and randomly assigns them to two groups. The “Music” group listens to their favorite music while playing a “matching” memory game. The “No Music” group plays the same game in silence. Below are summary statistics for the number of turns it took each subject to complete the game (fewer turns indicates a better performance). (a) Is there convincing evidence that listening to music increases the number of turns required to finish the memory game? (b) Suppose Matt allowed people to choose whether or not they were in the group that listened to music while playing the game? Give an example of a problem that might arise if the subjects were allowed to do this.

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Calculate M1 & M2. Then provide df1, df2, and df total.

Example: The statistics classroom is divided into three rows: front, middle, and back The instructor noticed that the further the students were from him, the more likely they were to miss class or use an instant messenger during class He wanted to see if the students further away did worse on the exams. A random sample of the students in each row was taken. The score for those students on the second exam was recorded Front: (82, 83, 97, 93, 55, 67, 53. n=t Middle: 83, 78, 68, 61, 77, 54, 69, 51, 63 na 9 Back: 38, 59, 55, 66, 45, 52, 52, 61 n: 8 و ممکن مامسدد equal tao 8.

You want to examine the relationship between dropping out of high school and delinquency. You have a random sample of 11 students. You have the number of delinquent offenses that each student reported committing in the year before and after dropping out of school. The following table shows the data. Student Before dropping out After dropping out 1 5 7 2 9 5 3 2 3 4 7 7 5 8 11 6 11 13 7 8 4 8 8 10 9 5 7 10 2 1 11 9 3 From performing a hypothesis test to determine if the mean number of delinquent differs after dropping out, what is the obtained t?

Treat the dataset as your bag of peanut M&M’s (a simple random sample). Count the number of orange M&M’s and the total number of M&M’s in your bag. Then determine the proportion of your M&M’s that are orange. Number of orange M&M’s: 13 Total number of M&M’s: 65 Proportion of orange M&M’s: 0.2   Question below is according to this.