Project #31012 - Statistics

 

The following Terms in the "Statistics Visual Learner" media piece: Hypothesis, Null Hypothesis, Alternative Hypothesis, Significance Test, and Test Statistic.

 

Complete the following exercises from "Questions and Problems" located at the end of each chapter and put them into a Word document to be submitted as directed by the instructor.

 

1. Chapter 10, # 3, 9, 13

 

2. Chapter 12, # 3, 5, 8, 16, 20, 21, 25

 

 

 

CHAPTER 10

 

(3). Explain in your own words why it is important to

 

know the possible errors we might make when rejecting

 

or failing to reject the null hypothesis.

 

(9). A primatologist believes that rhesus monkeys possess

 

curiosity. She reasons that, if this is true, then they

 

should prefer novel stimulation to repetitive stimulation.

 

An experiment is conducted in which 12 rhesus monkeys

 

are randomly selected from the university colony

 

and taught to press two bars. Pressing bar 1 always

 

produces the same sound, whereas bar 2 produces a

 

novel sound each time it is pressed. After learning to

 

press the bars, the monkeys are tested for 15 minutes,

 

during which they have free access to both bars. The

 

number of presses on each bar during the 15 minutes is

 

recorded. The resulting data are as follows:

 

Subject Bar 1 Bar 2

 

1 20 40

 

2 18 25

 

3 24 38

 

4 14 27

 

5 5 31

 

6 26 21

 

7 15 32

 

8 29 38

 

9 15 25

 

10 9 18

 

11 25 32

 

12 31 28

 

a. What is the alternative hypothesis? In this case,

 

assume a nondirectional hypothesis is appropriate

 

because there is insufficient empirical basis to

 

warrant a directional hypothesis.

 

b. What is the null hypothesis?

 

c. Using _ _ 0.052 tail, what is your conclusion?

 

d. What error might you be making by your conclusion

 

in part c?

 

e. To what population does your conclusion apply?

 

cognitive, biological

 

 

 

(13). A researcher is interested in determining whether

 

acupuncture affects pain tolerance. An experiment is

 

performed in which 15 students are randomly chosen

 

from a large pool of university undergraduate volunteers.

 

Each subject serves in two conditions. In both

 

conditions, each subject receives a short-duration

 

electric shock to the pulp of a tooth. The shock intensity

 

is set to produce a moderate level of pain to

 

the unanesthetized subject. After the shock is terminated,

 

each subject rates the perceived level of pain

 

on a scale of 0–10, with 10 being the highest level. In

 

the experimental condition, each subject receives the

 

appropriate acupuncture treatment prior to receiving

 

the shock. The control condition is made as similar to

 

the experimental condition as possible, except a placebo

 

treatment is given instead of acupuncture. The

 

two conditions are run on separate days at the same

 

time of day. The pain ratings in the accompanying

 

table are obtained.

 

a. What is the alternative hypothesis? Assume a

 

nondirectional hypothesis is appropriate.

 

b. What is the null hypothesis?

 

c. Using _ _ 0.052 tail, what is your conclusion?

 

d. What error might you be making by your conclusion

 

in part c?

 

e. To what population does your conclusion apply?

 

Subject Acupuncture Placebo

 

1 4 6

 

2 2 5

 

3 1 5

 

4 5 3

 

5 3 6

 

6 2 4

 

7 3 7

 

8 2 6

 

9 1 8

 

10 4 3

 

11 3 7

 

12 4 8

 

13 5 3

 

14 2 5

 

15 1 4

 

cognitive, health

 

 

 

 

 

CHAPTER 12

 

 

 

(3). How are sampling distributions generated using the

 

empirical sampling approach?

 

 

 

(5). What are the assumptions underlying the use of the

 

z test?

 

 

 

(8). How do each of the following differ?

 

a. s and sX

 

b. s2 and _2

 

c. _ and _X

 

d. _ and _X

 

 

 

(16). How does increasing the N of an experiment affect

 

the following?

 

a. Power

 

b. Beta

 

c. Alpha

 

d. Size of real effect

 

 

 

(20). A set of sample scores from an experiment has an

 

N _ 30 and an Xobt _ 19.

 

a. Can we reject the null hypothesis that the sample

 

is a random sample from a normal population

 

with _ _ 22 and _ _ 8? Use _ _ 0.011 tail. Assume

 

the sample mean is in the correct direction.

 

b. What is the power of the experiment to detect a

 

real effect such that _real _ 20?

 

c. What is the power to detect a _real _ 20 if N is

 

increased to 100?

 

d. What value does N have to equal to achieve a

 

power of 0.8000 to detect a μreal _ 20? Use the

 

nearest table value for zobt. other

 

 

 

(21). On the basis of her newly developed technique, a

 

student believes she can reduce the amount of time

 

schizophrenics spend in an institution. As director of

 

training at a nearby institution, you agree to let her

 

try her method on 20 schizophrenics, randomly sampled

 

from your institution. The mean duration that

 

schizophrenics stay at your institution is 85 weeks,

 

with a standard deviation of 15 weeks. The scores are

 

normally distributed. The results of the experiment

 

show that the patients treated by the student stay a

 

mean duration of 78 weeks, with a standard deviation

 

of 20 weeks.

 

a. What is the alternative hypothesis? In this case,

 

assume a nondirectional hypothesis is appropriate

 

because there are insufficient theoretical

 

and empirical bases to warrant a directional

 

hypothesis.

 

b. What is the null hypothesis?

 

c. What do you conclude about the student’s technique?

 

Use _ _ 0.052 tail. clinical, health

 

 

 

(25). A physical education professor believes that exercise

 

can slow the aging process. For the past

 

10 years, he has been conducting an exercise class

 

for 14 individuals who are currently 50 years old.

 

Normally, as one ages, maximum oxygen consumption

 

decreases. The national norm for maximum

 

oxygen consumption in 50-year-old individuals is

 

30 milliliters per kilogram per minute, with a standard

 

deviation of 8.6. The mean of the 14 individuals

 

is 40 milliliters per kilogram per minute. What

 

do you conclude? Use _ _ 0.051 tail. biological,

 

health

 

Subject Mathematics
Due By (Pacific Time) 05/17/2014 12:00 am
Report DMCA
TutorRating
pallavi

Chat Now!

out of 1971 reviews
More..
amosmm

Chat Now!

out of 766 reviews
More..
PhyzKyd

Chat Now!

out of 1164 reviews
More..
rajdeep77

Chat Now!

out of 721 reviews
More..
sctys

Chat Now!

out of 1600 reviews
More..
sharadgreen

Chat Now!

out of 770 reviews
More..
topnotcher

Chat Now!

out of 766 reviews
More..
XXXIAO

Chat Now!

out of 680 reviews
More..
All Rights Reserved. Copyright by AceMyHW.com - Copyright Policy