These questions should be asked more clearly.
If 3% is the standard deviation of the average then a 1% decrease in score is a z=-1/3, which is small in absolute value, so we can't reject the claim. In this interpretation we'd answer: -0.33, no.
But if we'll assume 3% is the standard deviation of the individual samples, it's a different story. We use percent as our unit. The standard deviation of the average is
.
So we get a z (really a t) here of
That's kinda borderline, a one sided t test with 29 dfs will give about the same probability as the normal distribution for a tail z=1.8, p=.036 aka p=3.6%. Typically we'd choose a 1% or 5% rejection threshold before we started; this one is in between.
Answer:
x= -
alturnative form x= -2
, x= -2.625
Step-by-step explanation:
Answer:
2-sqrt(3)
Step-by-step explanation:
google said
Answer:
35 cm ^2
Step-by-step explanation:
5x5 = 25
5-3 = 2
5x2 = 10
25+10 = 35cm^2
Answer:
The point estimate for the mean endowment of all private colleges in the United States is 180.2125 million dollars.
Step-by-step explanation:
We are given endowments (in millions of dollars) of eight private colleges in the United States:
78.8, 50.3, 243.2, 489, 111.5, 163.7, 92.4, 212.8
We have to find the point estimate of the population mean endowment of all private colleges in the United States.
The point estimate will be given by the sample mean.
Formula:
Thus, the point estimate is 180.2125 million dollars.
