Suppose you want to evaluate if there is a difference in population mean ages for Titanic passengers in 1s* class versus 3rd class. Since you do not have time to research the ages for all 32 1st passengers and all 706 3rd class passenger, you decide to use simple random sampling to sele 16 1st class passengers and 35 3rd class passengers. You research the ages for the two samples a summarize your data below: Statistics Variable N Mean SE Mean StDev 1stclassAges 16 35.875 4.282 17.126 3rdClassAges 35 25.229 1.478 8.742 a. Estimate the population mean age difference for 1st class versus 3rd class passengers, with a bound on the error of estimation. b. Is there evidence that the mean age of 1st class passengers is significantly different from the mean age of 3rd class passengers? Explain your answer using your results above.

we look at a random sample of 1000 united flights in the month of December comparing the actual arrival time to the scheduled arrive time. computer  output of the descriptive statistics for the difference in actual and expected arrival time of these 1000 flights are shown below : N=1000 Mean =4.06  St Dev. = 45.4  SE Mean =1.44  Min= -35  Q1 = -14  Median = -5  Q3 =9  Max =871  what is the sample mean difference in actual and expected arrival times?  what is the standard deviation of the difference ? x bar =      and s=    ?

We will refer to the data table below as "Facebook_Survey_Sample". In the first column 1:="yes" and 0:="no" In the "Gender" column 1:="Female" and 0:="Male" VisitsPerWeek Friends 1 45 100 0 0 1 25 60 1 40 80 m 1 40 60 0 0 1 15 40 1 30 25 80 150 90 Facebook 1 1 200 Age 34 65 46 29 21 25 22 18 42 52 Gender 1 0 0 1 1 1 1 1 Make a scatter plots by sex for VistsPerWeek vs. Friends for those in the Facebook_Survey_Sample who have a facebook account.

Describe a study in which you can use both nonparametric and parametric statistics. A researcher has participants expecting to receive either painful or mild electrical shocks during a study wait in a quarter-full waiting room with other participants. He then measures whether they choose to sit next to other participants or if they sit far away on their own. What is the best test to run for this study and why?

Explain the differences between independent samples and dependent samples as it applies to statistical testing of data.

What is the symbol for the sample variance?