Answer:
chloe and 16
Step-by-step explanation:
Answer:
Approximately, the 90% confidence interval for the students' mean IQ score is between 129.045 - 130.956
Step-by-step explanation:
The formula to use to solve this question is called the Confidence Interval formula.
Confidence interval =
x ± z × ( σ/ (√n) )
Where:
x = the sample mean = 130
z = the z-value for 90% confidence = 1.645
σ = standard deviation = 7
n = sample size = 145
130 ± 1.645 × (7/√145)
130 ± 0.9562687005
130 - 0.9562687005 = 129.0437313
130 + 0.9562687005 = 130.9562687005
Therefore, approximately, the 90% confidence interval for the students' mean IQ score is between 129.045 - 130.956
Answer:
Step-by-step explanation:
a is not proportional
b is not proportional
sorry if its wrong this isn't my strong suit
Answer:
2
Step-by-step explanation:
2. The median would be 18
Answer: y=
Step-by-step explanation:
y=mx+b is the slope-intercept form of a line, with m representing the slope and b signifying the y-value of the y-intercept. Because at x=0, y=4, the y-intercept is (0,4), and b=4.
Slope=(y2-y1)/(x2-x1) where (x1, y1) and (x2, y2) are both points on the line
To find the slope of the line, choose two points on the line with whole number coordinates:
(0,4) and (-3,0)
Now, plug these values into the slope formula:
slope=(4-0)/(0-(-3))
slope=
Therefore, m=.
Substitute m and b into y=mx+b:
y=
