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Week 3 Assignment

1

You want to survey buying habits related to organic cereal. You will sample at the 95% confidence level. You estimate the standard deviation to be ( S_est ) 10 boxes and you want the maximum allowable error at 2 boxes.

Calculate the random sample size       n

Now you have the data back and you calculate descriptive statistics and find the deviation for the data is ( S_real )  13.  Did you under sample or over sample? 

2

You have a group of people the number 9.

How many committees of 4 can you assemble without regard to order?

How many can you form of 4 where order matters?

3

There are 18 students in  a particular class I taught.  Each wrote his/her name on a slip and dropped it in a box.  How many different 4 person problem solving teams can I make from the 18 names Where Order Does no matter?

4

Recently you ran a large study over 200000 data points and came up with a mean, median and standard deviation. Mean = 345   Median = 340   Standard Deviation =  45.

Would you consider the data to be normally distributed?

5

You have a business selling a service of computer analysis that you want to start. You find out that the target customer-base is 14 companies.  You poll them and ask them how many times would they have called you in the past year for this service.  Here is their response.  Find out if the population is normal or is there any skew.  If there is skew, can you treat the population as normal or not  Obviously this is similar to #3 but you have to find the mean, median, standard deviation

Company                     Number of calls

A                                             3

B                                             2

C                                             4

      D                                             3

      E                                             5

      F                                             2

      G                                             3

      H                                             1

       I                                              4

       J                                              3

       K                                             3

       L                                              2

      M                                              4

      N                                               2