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
The total is $26 with the tip this is a 30% tip
The answer is 75 because 100/12=8.33. 8.33x3=25. 100-25=75.
4b = 5b - 3a # Starting equation, solve for 'a'
-b = -3a # Subtract 5b from both sides
= a # Divide both sides by -3.
a = # Use the reflexive property of equality
Hope this answers your question!
25x-25y that is the answer. You multiply the outside variable with the first variable inside the parenthesis. Next, you do the same thing to the other side and that is your answer. (unless you have to do more work)
