Answer:
Step-by-step explanation:
Data given
20 13 21 18 19 22 19 15 12 12 18 21
We can calculate the sample mean and deviation with the following formulas:
And we got:
represent the sample mean
population mean (variable of interest)
s=3.61 represent the sample standard deviation
n=12 represent the sample size
Confidence interval
The confidence interval for the mean is given by the following formula:
(1)
The degrees of freedom are given by:
Since the Confidence is 0.90 or 90%, the significance is and , the critical value would be given by
Now we have everything in order to replace into formula (1):
I got 25/21 or 1 4/21, but there’s a possibility I could’ve made a mistake in my math so you should double check it just in case.
W = g.m, with g = 9.8 m/s². If m is in kg, the weight W will be in Newton
a) W= 9.8 x 22.1 = 216.58 Newton
b) W= 9.8 x 33.5 = 328.30 N
And so on ...Continue by following the same
Answer:
Billy's salary should be $14,700, including the 5% increase.