Calculate standard deviation, average, 75th percentile. Also Construct two histograms, one with a class interval width of 1.0

Assuming that the population standard deviation is unknown, calculate the 95% confidence interval of the population...

Assuming that the population standard deviation is unknown, calculate the 95% confidence interval of the population mean. The following is the data. Calculating Process should be shown by Excel (Formulas). What formulas in statistics are used? 7 21 23 24 18 16 2 19 11 6 3 13 17 9 5 12 13 17 4 14 15 25 12 24 22 14 14 20 15 11 26 17 21 11 4 13 16 14 13 14 25 23 9 15...

The table below contains two samples (X and Y). Please construct a test where the null...

The table below contains two samples (X and Y). Please construct a test where the null hypothesis is that the population mean Y exceeds the population mean X by exactly 3. Please note that we don't know the population standard deviations and can't assume that they are equal. Please state the p-value of your test. X Y 15 13 10 13 11 12 12 19 11 14 17 15 11 19 16 18 15 14 10 12 17 12 16...

Percentile Question...easy, I'm sure, but I'm having trouble wrapping my head around this is figured...Thank you......

Percentile Question...easy, I'm sure, but I'm having trouble wrapping my head around this is figured...Thank you... Score:     12   13     14     15     16     17      18    19   20 Percent: 6% 8%   18% 24% 18%   10% 8% 6%   2% a) What score is the 25th percentile? b) What score is the 75th percentile? c) What score is the 70th percentile?

Traditionally, wine has been sold in glass bottles with cork stoppers. The stoppers are supposed to...

Traditionally, wine has been sold in glass bottles with cork stoppers. The stoppers are supposed to keep air out of the bottle because oxygen is the enemy of the wine. Particularly red wine. Recent research appears to indicate that metal screw caps are more effective in keeping air out of the bottle. However, metal caps are perceived to be inferior and usually associated with cheaper brands of wine. A random sample of 130 people who drink at least one bottle...

Using your data from Question 1, construct a 90% confidence interval for the population average home...

Using your data from Question 1, construct a 90% confidence interval for the population average home sale price in Whatcom county. (b)What does the confidence interval mean? (c) How is the confidence interval related to the Central Limit Theorem? (d) What is the difference between a hypothesis test and a confidence interval? House Price 1 819500 2 499950 3 569000 4 220000 5 110000 6 499999 7 389900 8 399000 9 650000 10 459000 11 975000 12 749000 13 848000...

Compute each of the following probabilities. Label each problem clearly and show all your work. Use...

Compute each of the following probabilities. Label each problem clearly and show all your work. Use the numbers you computed in earlier parts of the project based on the class data set. Problem 1: Suppose all of the Skittles in the class data set are combined into one large bowl and you are going to randomly select one Skittle. (a) What is the probability that you select a green Skittle? (4 points) (b) What is the probability that you select...

A manufacturing company is purchasing metal pipes of standard length from two different suppliers, ABC and...

A manufacturing company is purchasing metal pipes of standard length from two different suppliers, ABC and XYZ. In the past two months there are increasing complaints by the Production Manager that delivery times by ABC present higher variability in comparison to the delivery times by XYZ. The Production Manager is worried that this variability will make it harder to efficiently schedule the production process. Does the sample data indicate a statistically significant difference at the 5% level? Justify your answer....

A manufacturing company is purchasing metal pipes of standard length from two different suppliers, ABC and...

A manufacturing company is purchasing metal pipes of standard length from two different suppliers, ABC and XYZ. In the past two months there are increasing complaints by the Production Manager that delivery times by ABC present higher variability in comparison to the delivery times by XYZ. The Production Manager is worried that this variability will make it harder to efficiently schedule the production process. Does the sample data indicate a statistically significant difference at the 5% level? Justify your answer....

A manufacturing company is purchasing metal pipes of standard length from two different suppliers, ABC and...

A manufacturing company is purchasing metal pipes of standard length from two different suppliers, ABC and XYZ. In the past two months there are increasing complaints by the Production Manager that delivery times by ABC present higher variability in comparison to the delivery times by XYZ. The Production Manager is worried that this variability will make it harder to efficiently schedule the production process. If the variance of XYZ remains unchanged, what should be the variance of ABC in order...

calculate the upper and lower control limits and then construct a control chart. Display your chart....

calculate the upper and lower control limits and then construct a control chart. Display your chart. Question: Using the control chart rules for detecting special causes, can you detect a special cause? Explain why or why not. Week Average Delay Time (in days) 1 34 2 30 3 35 4 32 5 28 6 26 7 29 8 28 9 35 10 26 11 34 12 31 13 28 14 40 15 26 16 32 17 31 18 30 19...