Answer:
Step-by-step explanation:
An baseball player’s batting average decreases from 0.312 to 0.278 .
Let be the initial baseball player’s batting average and be the final baseball player’s batting average .
Initial value = 0.312
Final value = 0.278
So, change in value =Final value - Initial value = =
Therefore , decrease in value = 0.034
We know that percent decreased = ( decrease in value × 100 ) ÷ Initial value
i.e. ,
Or we can say percentage change in baseball player’s batting average =
Answer: Null hypothesis :
Alternative hypothesis :
Step-by-step explanation:
Given claim : The proportion of U.S. adults age 25 or older who smoke :
A researcher suspects that the rate is lower among U.S. adults 25 or older who have a bachelor's degree. i.e.
Since the null hypothesis is a fact checked by the researcher or the experimenter that always contains a equals to sign.
∴ Null hypothesis :
Alternative hypothesis :
The answer would be 1522188288? and rounded to 3 sf would be 1520000000?
Answer: Martha holding on to stocks that have poor market performance for three years is clearly an investing mistake.
Sanjay, Silvia and Sabrina seem to be making good investment decisions.
Ricardo is probably making a good decision too.
Step-by-step explanation:
I'm not sure that I can be of great help, because I have not read the Tutorial for this unit.
For me it is hard to tell about Ryan. I wonder what the Tutorial says. The fact that he has complete faith in a company may mean he has done a lot of research and understands the potential for the company to be profitable. But his faith in the company may be based on advertising or familiarity with a product. There may be other opportunities to invest in lesser known companies-- taking a risk may lead to opportunity. Maybe he should consult his stock broker or financial adviser.
Answer: y = 7cos(0.4π x) - 3
<u>Step-by-step explanation:</u>
The equation of a cosine function is: y = A cos(Bx - C) + D where
- Amplitude (A) is the distance from the midline to the max (or min)
- Period (P) is the length of one cosine wave --> P = 2π/B
- Phase Shift (C/B) is the horizontal distance shifted from the y-axis
- Midline (D) is the vertical shift. It is equal distance from the max and min
<u>Midline (D) = -3</u>
(-1.25, -3) is given as a point on the midline. We only need the y-value.
<u>Horizontal stretch (B) = 0.4π</u>
The max is located at (0,4) and also at (5, 4). Thus the period (length of one wave) is 5 units.
→ B = 0.4π
<u>Phase Shift (C) = 0</u>
The max is on the y-axis so there is no horizontal shift.
<u>Amplitude (A) = 7</u>
The distance from the midline to the max is: A = 4 - (-3) = 7
<u>Equation</u>
Input A = 7, B = 0.4π, C = 0, and D = -3 into the cosine equation.
y = A cos(Bx - C) + D
y = 7cos(0.4π x - 0) - 3
y = 7cos(0.4π x) - 3