Brailyn Robertson & Rebecca Shigo

DQ Background

The Beginning : • 1930’s • First sold during a trial

run at a friend's ice cream store in 1938

• 10 cents, all-you-can-eat

• Before the war in 1941 there were only 10 branches

• After 1947 there were over 100

Background Cont’d

Dairy Queen Today:• 5600 stores in 19

countries across the world

• 4600 are situated inside the US

Is there a difference in the amount of money males and

females spend at DQ?

Male vs. Female Spending Graph

0

5

10

15

20

25

30

35

Money Spent in Dollars

Male vs. Female

Male Female

Graph Analisis

• Overall the women seem to spend more than the men.

• The highest is an outlier is about $30. This was a woman that came in and bought a cake which is possibly for others.

• Spread

• r = .2533

• r² = .0641

Assumptions

State 1. 2 independent SRS’s

2. 2 Normal Populations Or

n1 > 30 and n2 > 30

Check1. Check

2. n1 > 30 and n2 > 30n1 = 31 and n2 = 30

2 Sample t-Test

Hypothesis:

• Ho: µ = 10• Ha: µ > 10

t = = -.921

P(t> -.921l df=38.991) = .8188

• We fail to reject Ho because the p-value is greater then µ = 0.05.

• We have sufficient evidence that the average amount of money spent by men and women is equal.

P Value

Confidence Interval

95% Confidence Interval

• Equation:

• (-2.872, 1.0737)

• We are 95% confident that the true mean of the amount of money males and females spend is between -2.872 and 1.0737 dollars.

In general do more Overweight people eat at

Dairy Queen?

Comparison of People Overweight

Waight of Average DQ Consumer

OverWeight50%

Average50%

OverWeight

Average

Graph Analysis

• The to are pretty much 50-50%

• The date is different than our prediction and what was predicted for the US.

• r = • r² =

Assumptions

State 1. SRS

2.

3.

Check1. Checked (as random

as possible)2. 55(.67)

55(1-.67) 3. Pop > 10(55)

> 10

1 Proportion t-Test

Hypothesis:• Ho: Po = .67• Ha: Po > .67

• t = = = -3.114

P- Value • P(z > -3.1114) = .99906

• We fail to reject ho because the p-value is greater than µ = 0.05.

• We have sufficient evidence that the true proportion is equal to the null hypothesis, P = .67.

Confidence Interval

95% Confidence• P + z p(1-p)

n

• (.34078, .60467)

• We are 95% confident that the true proportion of overweigh people that eat at Dairy Queen is between .34078 and .60467.

Is there a relation between the toppings and ice cream flavors

in a blizzard?

Blizzards Graph

Conclusion