Answer:
There is enough evidence to claim that population mean 1 is less than population 2 at the 0.05 significance level.
Step-by-step explanation:
We are given the following in the question:
Group 1:

Group 2:

Alpha, α = 0.05
First, we design the null and the alternate hypothesis
Since, the population variances are equal and that the two populations are normally distributed, we use t-test(pooled test) for difference of two means.
Formula:
Pooled standard deviation



Putting all the values we get:



Now,

Since,

We fail to accept the null hypothesis and reject the null hypothesis. We accept the alternate hypothesis.
We conclude that the mean score for Group 1 is significantly lower than the mean score for Group 2.
There is enough evidence to claim that population mean 1 is less than population 2 at the 0.05 significance level.
Answer:
7
2
+
3
3
Step-by-step explanation:
Answer:
A
Step-by-step explanation:
4 x $0.85= $3.40
$9-$3.40= $5.60
Step-by-step explanation:
B. 426 people per square. mile
Answer:
the answer is 312 hopes this helps
Step-by-step explanation:
the square root of 144 is 12
12+12^2 =?
12+144=156
156x6=936
936/3=?
312