Imagine you collect a sample of sales data from 20 people in your company and the...
Imagine you collect a sample of sales data from 20 people in your company and the sample average sales per person is $8900 per month. The estimated sample standard deviation is $1000. If the true mean of sales per month across the whole company is $10000, how probable is it that your sample mean would be LESS THAN $8900 per month.
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Imagine you collect a sample of sales data from 20 people in
your company and the...
If I hypothesize that the true mean of sales is $10000 then collect a sample of...
If I hypothesize that the true mean of sales is $10000 then collect a sample of sales data from 20 people in your company and the sample average sales per person is $8900 per month. The estimated sample standard deviation is $1000, and then estimate a p-value of 0.0000951 , what should I conclude? Assume we are shooting for a 5% (or 0.05) confidence level?
The national average cost of cable TV bills was reported as $99. You collect a random sample of 75 people in your town a...
The national average cost of cable TV bills was reported as $99. You collect a random sample of 75 people in your town and find the average cable bill is $103 with a standard deviation of $13.50. You want to compute a 99% confidence interval estimate for the mean difference between the national average and your town average. What is the margin of error?
7. If a random sample of 50 people are chosen from a population where the average...
7. If a random sample of 50 people are chosen from a population where the average age is 30 with a standard deviation of 5 years, answer the following: A) What is the expected mean age of your sample of 50 people? B) What is the standard deviation of sample averages here? C) What is the probability that your sample average is less than 27?
12. Selecting a measure of central tendency Suppose you collect a sample of 1,000 people. For...
12. Selecting a measure of central tendency Suppose you collect a sample of 1,000 people. For each person in your sample, you have measured a value for each of the variables listed in the first column of the following table. For each variable, select which of the measures of central tendency are appropriate to use to describe your sample's values for that variable. Check all that apply. Appropriate Descriptive Statistic Mode Median Mean Variable Description Titles of TV shows watched...
You collect a set of data around a group of coworkers' incomes (in hourly wages). You...
You collect a set of data around a group of coworkers' incomes (in hourly wages). You find that among that group there is a mean income of $24 per hour, with a standard deviation of $4.55. If someone had never heard of mean and standard deviation, how would you describe these findings to them in the case of this finding across your coworkers?
Sample Size: non-proportion and proportion data You would like to determine the average diameter of a...
Sample Size: non-proportion and proportion data You would like to determine the average diameter of a cylindrical pin that is manufactured by your company. How many samples would we need to collect if we wish to be 97% confident that the sample mean will be within 0.0005 inch of the true mean given that the population has a standard deviation of 0.0015 inch and is approximately normally distributed.
How many data observations are present (sample size)? What is the sum of the data? What...
How many data observations are present (sample size)?
What is the sum of the data?
What is the mean (average) of the data (unrounded)?
What is the median of the data?
What is the minimum value of the data?
What is the maximum value of the data?
What is the square root of the sample size (unrounded)?
What is the value of the third observation when squared?
What is the square root of the sample size (to 2 digits)?
What...
You collect 53 samples of hair from baby river otters and find that they are, on...
You collect 53 samples of hair from baby river otters and find that they are, on average, 22.6 mm long, with a standard devaition of 15.2mm. Then you collect 41 samples of hair from baby sea otters and find that they are, on average, 26.4 mm long, with a standard deviation of 11.4 mm. Is there statistical evidence at the 0.05 significance level that the true mean of baby sea otter hair length exceeds the true mean of baby river...
Using confidence intervals to determine how many samples you’ll need to collect so the average voltage...
Using confidence intervals to determine how many samples you’ll need to collect so the average voltage will be within the desired accuracy. This will take some assumptions and some work. So, here goes: The confidence interval (CI) equation is: Assume that the voltage you are measuring has a true mean (of course we don’t know the actual mean or true value, but that’s OK) of approximately 1 volt. Next, suppose you desire to know your average () vs “true” value...
Imagine you are examining the effects of smoking in heart-disease death rates. You collect an SRS...
Imagine you are examining the effects of smoking in heart-disease death rates. You collect an SRS of 2,789 young women who are smokers and 3,498 who are non-smokers. Your results are: Groups Average Number smoking related death Sample Standard Deviation Smokers 7.8 0.18 Non-smokers 1.9 0.06 Conduct a two-sample independent t test to determine if there is a significant difference in smoking-related deaths between the two groups using an alpha of 0.05. Include your conclusion.
7. If a random sample of 50 people are chosen from a population where the average age is 30 with a standard deviation of 5 years, answer the following: A) What is the expected mean age of your sample of 50 people? B) What is the standard deviation of sample averages here? C) What is the probability that your sample average is less than 27?
12. Selecting a measure of central tendency Suppose you collect a sample of 1,000 people. For each person in your sample, you have measured a value for each of the variables listed in the first column of the following table. For each variable, select which of the measures of central tendency are appropriate to use to describe your sample's values for that variable. Check all that apply. Appropriate Descriptive Statistic Mode Median Mean Variable Description Titles of TV shows watched...
How many data observations are present (sample size)?
What is the sum of the data?
What is the mean (average) of the data (unrounded)?
What is the median of the data?
What is the minimum value of the data?
What is the maximum value of the data?
What is the square root of the sample size (unrounded)?
What is the value of the third observation when squared?
What is the square root of the sample size (to 2 digits)?
What...
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