Answer:
Step-by-step explanation:
Hello!
So you have a new type of shoe that lasts presumably longer than the ones that are on the market. So your study variable is:
X: "Lifetime of one shoe pair of the new model"
Applying CLT:
X[bar]≈N(μ;σ²/n)
Known values:
n= 30 shoe pairs
x[bar]: 17 months
S= 5.5 months
Since you have to prove whether the new shoes last more or less than the old ones your statistical hypothesis are:
H₀:μ=15
H₁:μ≠15
The significance level for the test is given: α: 0.05
Your critical region will be two-tailed:


So you'll reject the null Hypothesis if your calculated value is ≤-1.96 or if it is ≥1.96
Now you calculate your observed Z-value
Z=<u>x[bar]-μ</u> ⇒ Z=<u> 17-15 </u> = 1.99
σ/√n 5.5/√30
Since this value is greater than the right critical value, i.e. Zobs(1.99)>1.96 you reject the null Hypothesis. So the average durability of the new shoe model is different than 15 months.
I hope you have a SUPER day!
9 mph because if it was 4/5 miles in 1/10 of an hour you just multiply it by 10 to get an hour and if you multiply 4/5 x 10 equals 40/5. simplified it is 9
Answer:
Population Of the United States
Weight of a small car
Length of a bed
Weight of an average man
Answer:
A. 2
Step-by-step explanation:
Part 2 of the graph is the only part where the line is decreasing. The rest of the parts are either horizontal or increasing
Answer:
Total width of tables combined = 16 feet and 4 inches
Step-by-step explanation:
Given:
Width of tables
1) 6 feet 3 inches
2) 3 feet 7 inches
3) 6 feet 6 inches
The tables are combined. We need to find the total width.
Total width of the tables combined = Sum of the widths of the tables
⇒ 
Adding feet and inches together.
⇒ 
⇒ 
[∵
, we can split 
⇒ 
⇒ 
⇒ 
Total width of tables combined = 16 feet and 4 inches