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