how do you know how many to use in a sample size I have almost 4...
how do you know how many to use in a sample size I have almost 4 years worth of monthly visit data and not sure how many to use to forecast average change, confidence interval, average percent change, moving average, exponential smoothing?
Homework Answers
It depends on your margin of error, MoE. That is, how much error, at most, would you accept.
Let us say you will accept at most 20 visitors from your mean estimate which means your mean estimate will be at most more or less by 20 visitors. So, MoE =20
Let the Standard deviation, 
=100
visitors.
Let the conference level =95%. So, Z =1.96
Now, the required sample size, n is calculated as follows:
MoE =Z.
=(1.96*100/20)2 =97 (rounded to next
integer).
Not quite sure what to do on this one. I know how to use a normal...
Not quite sure what to do on this one. I know how to use a normal distribution table, but doesn't this question require a confidence level or do I assume one and compare an alternative hypothesis(tow-tail). Find the value of the z statistic in the following example: in the 1990-s a Gallup poll was run to determine how many people shop on-line. (Today, almost everyone does, but back then, it was not the case). Test the claim that the proportion...
Question: How can I determine the sample size given the standard error (SE <= 70), and...
Question: How can I determine the sample size
given the standard error (SE <= 70), and in the confidence
intervals of 95% and 85% using t-tables.
Side Note: I am studying for my finals and have
been asked to answer the following question but I am not completely
sure how to do so. I believe I would have to have the standard
deviation provided to answer this, but am not completely sure if
that is the case. If this does...
i dont understand how to find this practice problems answer? We want to know how many...
i
dont understand how to find this practice problems answer?
We want to know how many people plan on buying a new car this year. Determine the sample size needed for a one proportion confidence interval to estimate this with a margin of error of 0.07 and a 95% confidence interval. We don't have any idea what the population proportion would be.
I wonder only both (d) and (e). If you use excel, please show what you do exactly. Please help me. Thanks. ts) Can-Do Canoe sells lightweight portable canoes. Quarterly demand for its most 2. (70...
I wonder only both (d) and (e).
If you use excel, please show what you do exactly.
Please help me. Thanks.
ts) Can-Do Canoe sells lightweight portable canoes. Quarterly demand for its most 2. (70 point ar product family over the past 3 years has been as follows. popul 2015 2 2016 2 2017 Year Demand 25 120 40 60 30 140 608035 150 55 90 4 Quarter a) (10 points) Use an exponential smoothing model with smoothing constant a...
You are an operation manager at Gambas Berhad. You plan to use several forecasting methods for...
You are an operation manager at Gambas Berhad. You plan to use several forecasting methods for the purpose. The following data represent the actual monthly company sales for 2018. Month Value (RM000 32 41 53 59 46 31 27 24 10 35 54 105 Ja March ril un August ber November December (a) Calculate the Mean Absolute Deviation (MAD) and make a forecast for January 2019 sales based on the following methods: i. 4-month moving average. (5 marks) i. Weighted...
This is non graded practices question but i would like to know how to do it...
This is non graded practices question but i would like to know
how to do it step by step.
a. The MGM Great Hotel in Las Vegas wants to estimate the mean time taken by its operators to make reservations. In a random sample of 100 reservation telephone calls to the reservation center (out of tens of thousands received during that time period), the mean time taken to complete a reservation is six minutes with a standard deviation of two...
How many calories do you think you burn or expend with 60 minutes of walking on...
How many calories do you think you burn or expend with 60 minutes of walking on the treadmill? An article that appeared in the American Journal of Men’s Health (2010) presented the results of a study conducted by researchers Harris and George, whose objective was to evaluate how accurately men can estimate their energy expenditure (EE) as measured in kilocalories (kcal). 82 normal-weight and overweight male participants, ages 21–45 years, were recruited from a large, urban university in South Florida....
Help with these four analytical chemistry problems. I don't know how to do it and would...
Help with these four analytical chemistry problems. I don't
know how to do it and would like to know how to do it along with
the correct answer to prepare myself for my exam
Note: Show all your work to eam full credit. Type or write your answers neatly and in logical order. 1. (5 points) Decide which of the following expresses precision and which expresses accuracy? Standard deviation Absolute error Variance Percent relative error Percent relative standard deviation 2....
I have to conduct a Hypothesis Test on my sample Size. sample size=58 (the first process...
I have to conduct a Hypothesis Test on my sample Size. sample size=58 (the first process involved 40 expenses and the second process was 18 expenses) I need to conduct a hypothsis test on this evaluation. •Confidence Interval: Before Improvement •X=40 •N=58 •p=40/58=0.68 •Confidence Interval: After the improvement •X=18 •N=58 •P=18/58=0.31 •Confidence Interval: (0.191, 0.429) •95% confidence (1.96)that the interval contains the true population proportion. With a Margin of error:1 • •Before the Improvement: • •Sample Standard Deviation, s 48.908185591827...
A simple random sample of size n is drawn. The sample mean, , is found to...
A simple random sample of size n is drawn. The sample mean, , is found to be 19.2, and the sample standard deviation, s, is found to be 4.6. Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about u if the sample size, n, is 35. Lower bound: I; Upper bound: (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about u if...
Question: How can I determine the sample size
given the standard error (SE <= 70), and in the confidence
intervals of 95% and 85% using t-tables.
Side Note: I am studying for my finals and have
been asked to answer the following question but I am not completely
sure how to do so. I believe I would have to have the standard
deviation provided to answer this, but am not completely sure if
that is the case. If this does...
i
dont understand how to find this practice problems answer?
We want to know how many people plan on buying a new car this year. Determine the sample size needed for a one proportion confidence interval to estimate this with a margin of error of 0.07 and a 95% confidence interval. We don't have any idea what the population proportion would be.
I wonder only both (d) and (e).
If you use excel, please show what you do exactly.
Please help me. Thanks.
ts) Can-Do Canoe sells lightweight portable canoes. Quarterly demand for its most 2. (70 point ar product family over the past 3 years has been as follows. popul 2015 2 2016 2 2017 Year Demand 25 120 40 60 30 140 608035 150 55 90 4 Quarter a) (10 points) Use an exponential smoothing model with smoothing constant a...
You are an operation manager at Gambas Berhad. You plan to use several forecasting methods for the purpose. The following data represent the actual monthly company sales for 2018. Month Value (RM000 32 41 53 59 46 31 27 24 10 35 54 105 Ja March ril un August ber November December (a) Calculate the Mean Absolute Deviation (MAD) and make a forecast for January 2019 sales based on the following methods: i. 4-month moving average. (5 marks) i. Weighted...
This is non graded practices question but i would like to know
how to do it step by step.
a. The MGM Great Hotel in Las Vegas wants to estimate the mean time taken by its operators to make reservations. In a random sample of 100 reservation telephone calls to the reservation center (out of tens of thousands received during that time period), the mean time taken to complete a reservation is six minutes with a standard deviation of two...
Help with these four analytical chemistry problems. I don't
know how to do it and would like to know how to do it along with
the correct answer to prepare myself for my exam
Note: Show all your work to eam full credit. Type or write your answers neatly and in logical order. 1. (5 points) Decide which of the following expresses precision and which expresses accuracy? Standard deviation Absolute error Variance Percent relative error Percent relative standard deviation 2....
A simple random sample of size n is drawn. The sample mean, , is found to be 19.2, and the sample standard deviation, s, is found to be 4.6. Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about u if the sample size, n, is 35. Lower bound: I; Upper bound: (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about u if...
Most questions answered within 3 hours.
-
QUESTION 31
In grid computing, the slowest computer creates a bottleneck and
slows down the entire...
asked 6 minutes ago -
A 236-m-wide river flows due east at a uniform speed of 2.1 m/s.
A boat with...
asked 14 minutes ago -
Here are the results of a monthly index model of stock returns
for FinCorp Stock: r(Fincorp)...
asked 6 minutes ago -
Answer the following questions based on this following business
startup idea:
Our business concept is individualized...
asked 16 minutes ago -
Red light of wavelength 650nm in air passes through two slits
submerged under water with n=1.33....
asked 9 minutes ago -
A random sample of 40 adults with no children under
the age of 18 years reaults...
asked 28 minutes ago -
Now that we have some familiarity with random variables, we are
going to start a discussion...
asked 31 minutes ago -
A beam of microwaves with λ = 0.9 mm is incident upon a 9 cm
slit....
asked 24 minutes ago -
It is common to hear comments like “Why do baseball players
earn millions of dollars a...
asked 23 minutes ago -
You
are setting up a class so that you can train several junior
administrators on Windows...
asked 31 minutes ago -
True or False?
1) The superfund legislation established a national trust fund
to pay for the...
asked 41 minutes ago -
n January 1, Coldwater Company has a net book value of
$1,683,000 as follows:
1,050 shares...
asked 40 minutes ago