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Homework 7

 

For the following frequency distribution, create a frequency histogram. Is the data normally distributed?

 

scores	frequency
50	1
55	5
60	6
65	10
70	13
75	16
80	14
85	12
90	10
95	6
100	2

 

 

 

2. Scenario A. A researcher has developed a new vaccine for the flu and wants to see if it works better than the old vaccine for the flu. She randomly assigns participants to either receive the new vaccine or the old vaccine and measures the % of people who contract the flu. What is the null hypothesis?

3. Scenario A. A researcher has developed a new vaccine for the flu and wants to see if it works better than the old vaccine for the flu. She randomly assigns participants to either receive the new vaccine or the old vaccine and measures the % of people who contract the flu. What is the alternative hypothesis? Is it directional or non-directional?

4. Scenario A. A researcher has developed a new vaccine for the flu and wants to see if it works better than the old vaccine for the flu. She randomly assigns participants to either receive the new vaccine or the old vaccine and measures the % of people who contract the flu. What would be a Type I error for this scenario? You'll have to come up with this one on your own!

5. Scenario A. A researcher has developed a new vaccine for the flu and wants to see if it works better than the old vaccine for the flu. She randomly assigns participants to either receive the new vaccine or the old vaccine and measures the % of people who contract the flu. What would be a Type II error for this scenario? You'll have to come up with this one on your own!

6. Scenario B. Ben sees a commercial for a new energy drink (HeartRacer) that claims to give you more energy than Red Bull. He decides to test out whether HeartRacer gives you more energy than Red Bull.  He asks 10 friends to drink HeartRacer and 10 friends to drink RedBull and measures how much energy they have. What is the null hypothesis for this scenario?

7. Scenario B. Ben sees a commercial for a new energy drink (HeartRacer) that claims to give you more energy than Red Bull. He decides to test out whether HeartRacer gives you more energy than Red Bull.  He asks 10 friends to drink HeartRacer and 10 friends to drink RedBull and measures how much energy they have. What is the correct alternative hypothesis for this scenario?

8. Scenario B. Ben sees a commercial for a new energy drink (HeartRacer) that claims to give you more energy than Red Bull. He decides to test out whether HeartRacer gives you more energy than Red Bull.  He asks 10 friends to drink HeartRacer and 10 friends to drink RedBull and measures how much energy they have. What would be a type I error for this scenario?

9. Scenario B. Ben sees a commercial for a new energy drink (HeartRacer) that claims to give you more energy than Red Bull. He decides to test out whether HeartRacer gives you more energy than Red Bull.  He asks 10 friends to drink HeartRacer and 10 friends to drink RedBull and measures how much energy they have. What would be a type II error for this scenario?

10. Scenario C. A researcher is interested in examining whether virtual contact (talking on the phone or over video chat) or physical contact (being physically present in the room)  is better for enhancing feelings of bonding between friends. She randomly assigns participants to either sit next to their friend in a room and talk for 20 minutes (physical contact), or to talk virtually over video chat for 20 minutes (virtual contact), and then measures feelings of bonding. What is the null hypothesis?

11. Scenario C. A researcher is interested in examining whether virtual contact or physical contact is better for enhancing feelings of bonding between friends. She randomly assigns participants to either sit next to their friend in a room and talk for 20 minutes (physical contact), or to talk virtually over video chat for 20 minutes (virtual contact), and then measures feelings of bonding. What is the alternative hypothesis? Is this directional or non-directional?

12. Scenario C. A researcher is interested in examining whether virtual contact or physical contact is better for enhancing feelings of bonding between friends. She randomly assigns participants to either sit next to their friend in a room and talk for 20 minutes (physical contact), or to talk virtually over video chat for 20 minutes (virtual contact), and then measures feelings of bonding. What would be a type I error for this scenario? (I'll help you out a little with this one and give you some options to choose from):

13. Scenario C. A researcher is interested in examining whether virtual contact or physical contact is better for enhancing feelings of bonding between friends. She randomly assigns participants to either sit next to their friend in a room and talk for 20 minutes (physical contact), or to talk virtually over video chat for 20 minutes (virtual contact), and then measures feelings of bonding. What would be a type II error for this scenario? (I'll help you out a little with this one and give you some options to choose from):