Answer: Yes
Step-by-step explanation:
Imagine you have b = 2.
Plug 2 into the equation 2b + b = 3b
You get: 2(2) + 2 = 3(2)
Which solves to be 6 = 6
As long as the variable is the same, in this case b, and they are to the same power, in this case ^1, you can combine them.
Answer: One sample z test for means
Step-by-step explanation:
From the information given, the sample size is large. It is greater than 30. Again, the population standard deviation is given. This means that the test statistic would be the z score which is determined by the formula
z = (x - µ)/σ
Where
x = sample mean
µ = population mean
σ = population standard deviation
The probability value would be determined from the normal distribution table.
Therefore, the hypothesis test that should be used is
One sample z test for means
Their are 26 cats and 19 dogs in the store . 26+19=45 .
