Answer:
Yes, we can conclude that the population standard deviation of TV watching times for teenagers is less than 2.66
Step-by-step explanation:
H0 : σ² = 2.66²
H1 : σ² < 2.66²
X²c = (n - 1)*s² ÷ σ²
sample size, n = 40
Sample standard deviation, s = 1.9
X²c = ((40 - 1) * 1.9²) ÷ 2.66²
X²c = 140.79 ÷ 7.0756
X²c = 19.897
Using a confidence level of 95%
Degree of freedom, df = n - 1 ; df = 40 - 1 = 39
The critical value using the chi distribution table is 25.6954
Comparing the test statistic with the critical value :
19.897 < 25.6954
Test statistic < Critical value ; Reject the Null
Hence, we can conclude that the population standard deviation of TV watching times for teenagers is less than 2.66
Answer:
The independent variable, which will go on the x-axis, is the price of the t-shirts.
The dependent variable, which will go on the y-axis, is the number of t-shirts sold.
Step-by-step explanation:
I took the test (: (Sorry it's late)
The way you would answer this question is dividing 27 by 3, which equals 9, (this because its the converse of doing the question "Lucia spotted 9 fish, but her sister Betina spotted 3 times as many (3x9=27)
