Answer:
3.06
Step-by-step explanation:
The correct answer is - 3.06
Reason -
For sample A :
mean, = 8.05
Standard deviation, = 1.36
Size, = 50
For sample B :
mean, = 7.26
Standard deviation, = 1.06
Size, = 38
Now,
-
= 8.05 - 7.26 = 0.79
Standard deviation error, SE = √(²/
+
²/
) = 0.2580
Now,
Z-statistic = ( -
)/ SE
= 0.79/0.2580
= 3.06
⇒Z-statistic = 3.06
Answer:
D. Yes, because the frequencies start low, proceed to one or two high frequencies, then decrease to a low frequency, and the distribution is approximately symmetric.
Step-by-step explanation:
Hello!
The given frequency distribution for temperatures.
To see if the distribution appears to have a normal distribution you have to draw a histogram using the information. Check attachment.
As you can see, the distribution appears symmetric, it starts low and proceeds to grow until it reaches its maximum point (f(4)=13) and then starts to decrease to low frequencies. The right tail decreases a little more than the left one but it is almost symmetrical.
I hope this helps!
