# 11.8 Lab 2: chi-square test of independence

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Class Time:

Names:

## Student learning outcome

• The student will evaluate if there is a significant relationship between favorite type of snack and gender.

## Collect the data

1. Using your class as a sample, complete the following chart. Ask each other what your favorite snack is, then total the results.

## Note

You may need to combine two food categories so that each cell has an expected value of at least five.
Favorite type of snack
sweets (candy&baked goods) ice cream chips&pretzels fruits&vegetables Total
male
female
Total
2. Looking at [link] , does it appear to you that there is a dependence between gender and favorite type of snack food? Why or why not?

## Hypothesis test

Conduct a hypothesis test to determine if the factors are independent:

1. H 0 : ________
2. H a : ________
3. What distribution should you use for a hypothesis test?
4. Why did you choose this distribution?
5. Calculate the test statistic.
6. Find the p -value.
7. Sketch a graph of the situation. Label and scale the x -axis. Shade the area corresponding to the p -value.
9. State your conclusion in a complete sentence.

## Discussion questions

1. Is the conclusion of your study the same as or different from your answer to answer to question two under Collect the Data ?
2. Why do you think that occurred?

how is useful
how is stem and leaf plot or display differ from double stem and leaf plot or display
What is the variances of 568
friend
what variance would have a single value..?
friend
variance happened only in a group of values..
friend
if we have a group of values...1st we find its average..ie..'mean'..then we calculate each value's difeerence from the mean..then we will square each 'difference value'.then we devide total of sqared value by n or n-1..that is what variance...
friend
News
What is the variances of 258
66,564
Mampy
what is the sample size if the degree of freedom is 25?
26..
friend
25
Tariku
27
Tariku
degrees of freedom may differ with respect to distribution...so tell which distribution you have selected...?
friend
my distribution is 27
Tariku
what is degree of freedom?
Rohit
how to understand statistics
you are working for a bank.The bank manager wants to know the mean waiting time for all customers who visit this bank. she has asked you to estimate this mean by taking a sample . Briefly explain how you will conduct this study. assume the data set on waiting times for 10 customers who visit a bank. Then estimate the population mean. choose your own confidence level.
what marriage for 10 years
fit a least square model of y on x ? what is the regression coefficient ? x : 2 3 6 8 9 10 y : 5 6 7 10 8 11
how can we find the expectation of any function of X?
Jennifer
I've been using this app for some time now. I'm taking a stats class in college in spring and I still have no idea what's going on. I'm also 55 yrs old. Is there another app for people like me?
Tamala
Serious
Hamza
yes I am. it's been decades since I've been in school.
Tamala
who are u
zaheer
is there a private chat we can do
Tamala
hello how can I get PDF of solutions introduction mathematical statistics ( fourth education) who can help me
ahssal
can anyone help me
Halim
what is probability
simply probability means possibility.. definition:Probability is a measure of the likelihood of an event to occur.
laraib
fit a least square model of y on x ? what is the regression coefficient ? x : 2 3 6 8 9 10 y : 5 6 7 10 8 11
Nayab
classification of data by attributes is called
qualitative classification
talal
tell me details about measure of Dispersion
Halim
Following data provided Class Frequency less than 10 10-20 5 15 10-30 25 12 40 and above Which measure of central tendency would you compute and why?
a box contains a few red and a few blue balls.one ball is drawn randomly find the probability of getting a red ball if we know that there are 30 red and 40 blue balls in the box
3/7
RICH
Total=30+40=70 P(red balls) =30/70 Therefore the answer is 3/7
Anuforo
define transport statistical unit
describe each transport statistical unit
Dennis
explain uses of each transport statistical unit
Dennis
identify various transport statistical units with their example
Dennis
I didn't understand about Chi- square.