Consider the following data:   and   What is the sample regression equation?

In a study of store checkout scanners, a sample of 1234 items were checked and 20 of them were overcharges. It had been claimed by the manufacturers that only 2% of the sales would be overcharges. Based on these results, at the 1% level of significance, do the scanners appear to overcharge less often than the 2%?

(1) List all the information necessary for conducting the hypothesis test and state which

test you are doing.

(2) State the null and alternative hypotheses and whether you would use a right-tailed

test, a left-tailed test, or a two-tailed test.

(3) Sketch the critical reason, indicating on the sketch what the critical value(s) are.

(4) Determine the calculated z or t.

(6) Decide if you will Reject or Fail to Reject the Null Hypothesis.

(7) Interpret your conclusion in terms of the problem.

Medical research has shown that repeated wrist extension beyond 20 degrees increases the risk of wrist and hand injuries. Each of 24 students at a university used a proposed new computer mouse design. While using the mouse, each student's wrist extension was recorded. Data consistent with summary values given in a paper are given. Use these data to test the hypothesis that the mean wrist extension for people using this new mouse design is greater than 20 degrees. (Use

α = 0.05.

Use a statistical computer package to calculate the P-value. Round your test statistic to two decimal places and your P-value to three decimal places.)

1. State your conclusion.

Reject H₀. We have convincing evidence that the mean wrist extension for all people using the new mouse design is greater than 20 degrees.

2. Are any assumptions required in order for it to be appropriate to generalize the results of your test to the population of students from this university?

We need to assume that the 24 students used in the study are representative of all students at the university.

3. Are any assumptions required in order for it to be appropriate to generalize the results of your test to the population of all university students?

1. We need to assume that the 24 students used in the study are representative of all students who use a wireless mouse.

2. We need to assume that the 24 students used in the study are representative of all students at the university.

3.. We need to assume that the 24 students used in the study are representative of all students who own PCs.

4. We need to assume that the 24 students used in the study are representative of all university students.

5.We need to assume that the 24 students used in the study are representative of all students in computer science classes

I am missing T and the third question

In a study of computer use, 1000 randomly selected Canadian Internet users were asked how much time they spend using the Internet in a typical week. The mean of the sample observations was 12.6 hours.

(a)

The sample standard deviation was not reported, but suppose that it was 4 hours. Carry out a hypothesis test with a significance level of 0.05 to decide if there is convincing evidence that the mean time spent using the Internet by Canadians is greater than 12.4 hours. (Use a statistical computer package to calculate the P-value. Round your test statistic to two decimal places and your P-value to three decimal places.)

t= 1.58

P-value= .057

State the conclusion in the problem context.

Do not reject H₀. We do not have convincing evidence that the mean weekly time spent using the Internet by Canadians is greater than 12.4 hours.

Now suppose that the sample standard deviation was 3 hours. Carry out a hypothesis test with a significance level of 0.05 to decide if there is convincing evidence that the mean time spent using the Internet by Canadians is greater than 12.4 hours. (Use a statistical computer package to calculate the P-value. Round your test statistic to two decimal places and your P-value to three decimal places.)

t=

P-value=

Listed below are the lead concentrations μ​g/g measured in different traditional medicines. Use a 0.05 significance level to test the claim that the mean lead concentration for all such medicines is less than 13 μ​g/g.Assume that the lead concentrations in traditional medicines are normally distributed.

8 22 15 .5 8.5 3.5 10 6.5 13.5 5.5 11 

1.Determine the test statistic (round two decimal)

2.Determine the P-value( round three decimal)

3.State the final conclusion that addresses the original claim  

6.56.5     

13.513.5     

5.55.5     

1111

Compare and contrast simple random sampling, stratified random sampling, and systematic sampling. Draw diagrams to show an example of each. What steps should be carried out to perform a simple random sample?

Situation #1: you want to look at a variable that you cannot manipulate

Situation #2: there are ethical needs that require quasi-designs

For each situation, tell me why a quasi-experimental design is needed given that situation. Describe a brief research study for each to justify a quasi-experimental (rather than experimental) design

Describe completely randomized and randomized complete block designs. What are the assumptions underlying the use of each experimental design? What is the main advantage of blocking?

Describe fixed point and point pattern spatial data. What is being measured in each type of approach? What are first and second order effects? What is positive and negative spatial correlation? To be completely spatially random provide two requirements that must be met.

Briefly describe a one-tailed vs two-tailed t-test in the context of hypothesis testing?

Suppose you are looking at the population of 8,000 students that are freshman at UTEP. You want to determine on average how many hours a week they work each week. Let’s call that number ?. You decide to take a sample of 100 of them.

1) How many data points are there in this space?

2) How many ways can you choose your subest of 100 students? Is it greater or less than the answer above.

3) How do you calculate the “point estimate” of one of those subsets of 100 students?

4) How many actual subsets of 100 students do you have as a researcher?

5) What does the Central Limit Theorem say about all the possible point estimates that can occur from the possible 100-student subsets? Draw a graph.

6) What value is the center of that curve? Please label it on the graph above.

The following table depicts the percentages of people within each county in northeast Florida that that rely on Medicare or Medicaid for their health insurance.

County % Residents on Medicare/Medicaid

Duval 12.00%

Columbia. 13.40%

Nassau 13.20%

Flagler 12.80%

Putnam 12.90%

Clay 23.10%

St Johns 11.60%

Baker 12.40%

Bradford 13.40%

A) Depict the information presented in the above table in a stem-and-leaf plot.

B) Describe the shape of the distribution.

C) What is the average percentage of residents that rely on Medicare/Medicaid for health insurance?

Define what categorical and continuous variables are and provide several examples of each.

A game works as follows: the player rolls one dice once (let's call it ''n'') and then he rolls it second time (let's call this second roll "m'') and receives n^m points .

A)What is the probability that n = 1 knowing that the player has received more than 20 points.
b) What is the probability that m = 1 knowing that the player has received more than 20 points.
c) (What is the probability that the player receives more than 20 points?
d) Let X be the following random variable: X = n knowing that the player has received more than 20 points. Give the probability of X.

cenario

Certified Behavior Analysts claim that their procedures are more effective than any other.  Their procedures are clear-cut analytics that anyone can learn and apply. It’s not an art they proclaim, but a science.  You decide to put it to test.  You interview and survey the parents of autistic kids, loved ones of the depressed, and former sufferers of phobias, who had been treated with Behavior Therapy, Drug Therapy, and Play Therapy.  Your survey generates a score from 1-100 with higher values indicating greater effectiveness of the therapy and 85 and above indicates complete resolution of the problem.  

            Behavior Therapy                   Drug Therapy              Play Therapy

            58, 65, 71, 59,                         59, 68, 32, 44              58, 61, 50, 60

            81, 74, 83, 63                          38, 41, 30, 51              64, 62, 85, 57

Instructions:

1. Using the above data calculate the one-way analysis of variance in JASP. Report the F-ratio in APA style, including the p-value and eta-squared (treatment magnitude).

2. If the one-way ANOVA shows a significant difference among the groups, then calculate post hoc test to determine which groups are different – be sure you compare each group to each other group. Report the significant differences among the groups. If the one-way ANOVA does not show a significant difference, then state no difference.  

3. Calculate the mean and standard deviations for all three groups and report in an APA table. You may use the one generated by JASP.

4. Write a short APA summary of your conclusions. Make sure to use the data to support conclusions.