Define.

(a) Descriptive statistics

(b)Inferential Statistics

(c)Nominal Data

(d) Ordinal data

(e)Standard deviation

Brandon wants to find a cheap computer, but he knows that computer prices are extremely skewed, since most computers are very expensive. He knows that computer prices have a mean of $1,223 with a standard deviation of $1,214. Brandon finds the average price of 9 random computers. What is the probability the average price will be more than $1,688?
Use 4 decimal places.
Type in "cannot do" if that is your answer.

Identify if population parament or sample statistic:

Is statement population parameter or sample statistic? If, parameter, then identify population and parameter. If sample, then, what is population, sample, and statistic?

A) North Carolina State’s rugby team scored an average of 29.8 points per game in the 2015 season.

B) Based on a new poll of 5000 citizens, they believe that 89% of voters plan to cast their ballot for Mayor Green in the upcoming election.

C) A calculating fanatic conducts an experiment using 46 secretaries to see if there was an increase in typing speed and efficiency when changing from the QWERTY keyboard to the Dvorak keyboard. He found that the participants could type an average of 22.5 words per minute faster using the Dvorak keyboard.

D) A small business owner looks at his records from the past five years and determines that the average monthly cost of running his business is $5900.

2. Following, what level of measurement is used to measure variable? Identify if quantitative or categorical? If quantitative, identify if it is discrete or continuous?

A) How many cars have the persons owned over their lifetime?

B) Is the person dent right or left-handed?

C) What is the person's year of birth?

D) On a scale from 1 to 5, for 1 being not at satisfied and 5 being completely satisfied with the food, to what extent do you agree with the following statement – “I love math!”?

Statistics questions

In a Doctor’s office, the average wait time before a patient sees the doctor is normally distributed with mean 20minutes. Because of some actions taken at the office, the standard deviation has now reduced by 1 minute so, the standard deviation is now 2

7. Approximately 95% of the patients will now see a doctor between _______ and _________minutes

8. How unusual it is now to wait to be seen by the doctor for 30mins or more? _______% of patients wait beyond 30mins to be seen by a doctor.

9. 5% of the patients will now wait beyond______minutes

10. 10% of the (lucky!) patients will now be seen faster than how ________minutes

11. _______% of the patients wait more than 20mins to be seen by the doctor

A process has mean 11 and standard deviation 2.5. The process is monitored by taking samples of size 5 at regular intervals. The process is declared to be out of control if a point plots outside the 3σ control limits on a chart.

17a.) If the process mean shifts to 14, what is the average number of samples that will be drawn before the shift is detected on a X⎯⎯⎯X¯ chart?

17b.) An upward shift to what value will be detected with an ARL of 4?

17c.) If the sample size remains at 5, to what value must the standard deviation be reduced to produce an ARL of 4 when the process mean shifts to 14?

17d.) If the standard deviation remains at 2.5, what sample size must be used to produce an ARL of no greater than 4 when the process mean shifts to 14? Round up the answer to the nearest integer.

Suppose it is known that the IQ scores of a certain population of adults are approxi- mately normally distributed with a standard deviation of 15. A simple random sample of 25 adults drawn from this population had a mean IQ score of 105.

a) Is there evidence at 5% significance level that the average IQ in this population is not equal to 100?

Please also explain how you got the critical value.

Thanks!!!

1. Given: A 4-inch cube with all 6 faces painted is cut up into 64 1-inch cubes. A cube is picked at random. What is the probability that (a) It is unpainted: ________________________________ (b) It has at most 1 face painted: _________________________

In 2011, when the Gallup organization polled investors, 34% rated gold the best long-term investment. In April of 2013 Gallup surveyed a random sample of U.S. adults. Respondents were asked to select the best long-term investment from a list of possibilities. Only 241 of the 1005 respondents chose gold as the best long-term investment. By contrast, only 91 chose bonds.

1. Compute the standard error for each sample proportion. Compute and describe a 95% confidence interval in the context of the question.
2. Do you think opinions about the value of gold as a long-term investment have really changed from the old 34% favorability rate, or do you think this is just sample variability? Explain.
3. Suppose we want to increase the margin of error to 3%, what is the necessary sample size?
4. Based on the sample size obtained in part c, suppose 120 respondents chose gold as the best long-term investment. Compute the standard error for choosing gold as the best long-term investment. Compute and describe a 95% confidence interval in the context of the question.
5. Based on the results of part d, do you think opinions about the value of gold as a long-term investment have really changed from the old 34% favorability rate, or do you think this is just sample variability? Explain.

(Please show calculations especially if formatted via excel)

Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of 0.2 inches and a standard deviation of 0.05 inches. What proportion of woodlice have antenna lengths that are less than 0.23 inches? Round your answer to at least four decimal places.

Can you tell me the step by step process of how to do this?

Provide a substantive response that addresses all areas of the item below. Your organization has asked you to estimate the proportion of current employees who expect to retire by the age of 65. Develop an appropriate sampling frame and sampling approach to facilitate this task. Note: Your sample must be random. Outline the data collection process you would employ. Additionally, provide a substantive response to the following questions:

I chose my company to have 500 employees and a sampling frame of 21.

(Employee #1- 132, #2 - 223, 3 - 455, #4 - 63, #5 - 447, #6- 324, #7-320, #8 - 333 #9 - 258, #10 - 263, #11- 34, #12 - 137, #13 - 226, #14 - 353, #15 - 59, #16 - 24, #17 - 261, #18 - 424, #19 - 146, #20 - 28 #21 - 62.

Q1. Is using 21 employees for a sampling frame appropriate number for a population of 500? Was I suppose to use a formula to get the sampling frame or was my preference acceptable?

Q2. Do I randomly select the number for employees out of the 500 or is that a formula that needs to be calculated?

Q3. What considerations need to be made when defining and collecting information from a sample?

Q4. What problems might you encounter and how frequently might they occur? Please advise

Hello I need to know how to interpret the allowable increase and decrease for both the variable cells (doors and windows produced) and the constraints (Plants 1,2, and 3). Sensitivity reports and interpretation are discussed in the text on pp. 160-162.

The Pew Research Center Internet Project conducted a survey of 907 Internet users. This survey provided a variety of statistics on them.

If required, round your answers to four decimal places.

The grade appeal process at a university requires that a jury be structured by selecting four individuals randomly from a pool of thirteen students and nine faculty. (a) what is the probability of selecting a jury of all students? (b) what is the probability of selecting a jury of all faculty? (c) what is the probability of selecting a jury of two students and two faculty?

A club with 8 members elects a president, treasurer, and a secretary. How many ways can these positions be filled?
the club also forms a xommitee of 4 members, chosen from the entire membership including the new officers. How many possible different committees can be formed?