This is observation from previous years about the impact of students working while they are enrolled in classes, due to students too much work, they are spending less time on their classes. First, the observer need to find out, on average, how many hours a week students are working. They know from previous studies that the standard deviation of this variable is about 5 hours. A survey of 200 students provides a sample mean of 7.10 hours worked. What is a 95% confidence interval based on this sample?

((NO HANDWRITING PLEASE))

College tuition:

The mean annual tuition and fees in the 2013 - 2014 academic year for a sample of 15 private colleges in California was 32,500 with a standard deviation of $7250. A dotplot shows that it is reasonable to assume that the population that the population is approximately normal. Can you conclude that the mean tuition and fees for private institutions in California is less than 35,000? Use a = 0.05 level of significance and the critical value method.

The hypothesis is a ... test.

In a random sample of five microwave​ ovens, the mean repair cost was $60.00 and the standard deviation was $11.50

Assume the population is normally distributed and use a​ t-distribution to construct a 90​% confidence interval for the population mean μ. What is the margin of error of μ​? Interpret the results.

(a)The confidence interval for the population mean is _, _   ​(Round to one decimal place as​ needed.)

(b)The margin of error is _ ​(Round to two decimal places as​ needed.)

(c) Interpret the results. Choose the correct answer below:

1. It can be said that 95​% of microwaves have a repair cost between the bounds of the confidence interval.

2.With 95​% confidence, it can be said that the population mean repair cost is between the bounds of the confidence interval.

3.With 95​% confidence, it can be said that the repair cost is between the bounds of the confidence interval.

4.If a large sample of microwaves are taken approximately 95​% of them will have repair costs between the bounds of the confidence interval.

In​ Louisiana, the average weight of an adult allegator is 790​ pounds, with standard deviation of 200 pounds. What is the probability that the average wieght of a sample​(of adults​ allegators) of size 100 will be grater than 820​ pounds?

A.0.06

B.0.07

C.0.93

D.0.90

E.0.05

A researcher conducts an independent-measures study examining the effectiveness of a group exercise program at an assisted living facility for elderly adults. One group of residents is selected to participate in the program, and a second group serves as a control. After 6 weeks, the researcher assessed physical fitness of each participant.

The data are as follows: Exercise Group: Control Group: n = 15 n = 15 M = 37 M = 34 SS = 230 SS = 160 A. Does the exercise program have a significant effect on physical fitness? Use p < .05, 2-tails test.

B. If there is a significant effect, compute the estimated Cohen’s d to measure the size of the treatment effect.

C. Write a conclusion demonstrating how the outcome of the hypothesis test and the measure of effect size would appear in a research report in APA style.

Note: For full credit show all steps of hypothesis testing (i.e., write hypotheses, all computations, the tcritical used for the decision about H0 and the conclusion in APA reporting format).

In a random sample of 23 people, the mean commute time to work was 30.3 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a​ t-distribution to construct a 98​% confidence interval for the population mean .What is the margin of error of f μ​? Interpret the results.

(a)The confidence interval for the population mean is _, _   ​(Round to one decimal place as​ needed.)

(b)The margin of error is _ ​(Round to two decimal places as​ needed.)

(c) Interpret the results. Choose the correct answer below:

1. It can be said that 95​% is between the bounds of the confidence interval.

2.With 95​% confidence, it can be said that the population mean is between the bounds of the confidence interval.

3.With 95​% confidence, it can be said that is between the bounds of the confidence interval.

4.If a large sample is taken approximately 95​% of them are between the bounds of the confidence interval.

If n=20, ¯ x (x-bar)=36, and s=13, construct a confidence interval at a 99% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place.

You are a business consultant at a small consulting firm in Sydney Australia. A client Ben McDonald from office supplies retailer “Office Storeroom” has contacted you to ask for your help. Ben is the newly appointed sales manager at Office Storeroom. You arrange a meeting with Ben at a local coffee shop. During the meeting Ben explains that Office Storeroom is the longest running office supplies company in Australia, having started business in 1973. They pride themselves on providing the most affordable office supplies available. They sell office supplies to businesses and personal shoppers.

They have 15 retail outlets across Australia, one store in each of the major cities and a few in some of the larger regional areas. Office supplies are also sold online, via the Office Storeroom website. Interestingly, despite limited investment in online website and logistics, almost 65% of their business is now online. Online sales have significantly increased since Office Storeroom went online in 2013. However, during the same time-frame sales at retail outlets have declined.

Overall, sales at Office Storeroom have been declining for the past 3 years. Sales figures for the past 5 years are shown in the table below.

Table 1: Sales Figures

As the new head of sales (Ben joined in year 2017) at Office Storeroom, Ben is responsible for improving the sales of office supplies. During the meeting Ben explains that he knows it is his job to improve sales but he is unsure how to do this. He has asked for your help to conduct some research to help make some informed decisions about how to improve sales.

1. Develop research question(s) that address the concerns outlined in the above scenario.
2. What secondary data sources might be used to help answer the research question(s)?
3. Selection of primary data collection method(s): What primary data collection method(s) can you use to help develop some recommendations for Ben? Justify your chosen method(s).
4. Selection of sampling technique: Ben wants you to get staff opinions about the decline in sales. How will you obtain the sample? Justify your sampling design.
5. What ethical principles you should follow when conducting this research?
6. Identify limitations in the research design you described in Q3 (relating to data collection) and/or Q4 (relating to sampling).

Determine the​ P-value for this hypothesis test.

P=?​(Round to three decimal places as​ needed.)

1) Give an example of a research problem that you could use an independent –sample t test on.

2) Give an example of a research problem that you could use a paired-sample t test on.

Construct a BCH (7,4) code with the generator matrix G(p)=p3 +p+1. (Draw the structure of the encoder )

Conduct an Internet search to find a study whose statistical results have been published in the news or any other public forum. Applying the following guidelines, critically analyze the study’s reported content and results.

Identify the goal, population, and type of study.

Who conducted the study? Is there bias here?

Is there bias in the sample used in the study?

Are there any problems in defining or measuring the variables of interest in the study?

Are there any confounding variables present in the study?

Are the results presented fairly?

Is the study’s conclusion reasonable? Does it make sense?

Do the results make practical significance?

Nuclear physicist found the probability of neutral particles being reflected was 0.16 and of being absorbed as 0.84.

a. What is the expected number of particles that would be reflected if 1,000 are released?

b. Assuming the normal approximations to the binomial distribution, what is the probability that 140 or fewer particles would be absorbed?

PLEASE ANSWER THE THREE QUESTION WITH CORRCT DEATILAS

Who may request a copy of a birth and death certificate?

If the mother is not married, can the father’s name be placed on the birth certificate?

What does father need to sign in order to be placed on birth certificate of unwed mother?