Now, produce your own population parameter (think of either a proporiton, mean, or standard deviation) which you may be interested in determining. Numerical Results from Weighted Fit The results of the weighted fit are shown below. Condition(s) checked: Statcrunch Command Used: Interval: Interpretation: (c) (3 points) In this class you've seen many quantities being counted or measured and performing sta- tistical methods on those quantities. Use these sample results to construct a 95% confidence interval for the true value of the population mean. Choose the column that contains the frequencies in the 'Counts in:' drop-down menu. Choose the column that contains the class under the 'Bins in:' drop-down menu. Select Stat, highlight Summary Stats, and select Grouped/Binned data. A sample of 52 food baskets are weighted and it is found that the mean is 12.4 pounds with a standard deviation of 4 pounds. If necessary, enter the summarized data into the spreadsheet.
Condition(s) checked: Statcrunch Command Used: Interval: Interpretation: (b) (3 points) A food distributor is interested in estimating the amount of food in food baskets given to families. It is know that the miles per gallon (mpg) is normally distributed. Construct and interpret a 95% confidence interval for the population standard deviation fuel economy (mpg). In a survey of 16 vehicles the mean was 36.8 and the standard deviation was 2.917. (a) (3 points) Suppose that a car manufacturer is trying to determine the consistency, in miles per gallon their latest vehicle achieves. Check that the conditions are satisfied to find each confidence interval. Administration is considering taking more samples like this. I select the column where my data is located. of of their employees and finds that of those sampled are allergic to pets. Now that my data set is here in StatCrunch, I’m going to go into Stat > Variance Stats (because this is the only option StatCrunch has for testing standard deviations and hypothesis testing) > One Sample (because I have only one sample) > With Data (because I have an actual data set). An organization is considering having a 'Bring your pet to work' day.
Find the desired information in each given scenario. Mean and standard deviation of sample proportions. What should be the value of the standard deviation?Ī standard deviation close to 0 indicates that the data points tend to be very close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the data points are spread out over a wider range of values.Transcribed image text: 3.
Then work out the mean of those squared differences.Then for each number: subtract the Mean and square the result.Also question is, how do you find the standard deviation of a sample?