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lesya692 [45]
2 years ago
5

The Sport Journal (Winter 2004) reported on a study of a speed-training program for high school football players. Each participa

nt was timed in a 40-yard sprint both before and after training. The researchers measured two variables: (1) the difference between the before and after sprint times (in seconds), and (2) the category of improvement ("improved," "no change," and "worse") for each player. What is the type for the variable "improvement"?
A. Ordinal
B. Interval
C. Ratio
D. Nominal
Mathematics
1 answer:
ruslelena [56]2 years ago
7 0

Answer:

Ordinal

Step-by-step explanation:

The definition of ordinal type of variables states that "if the variable has meaningful ordering or the data values of variable can be arranged in ranking then the variable is ordinal"

Here are some examples of ordinal variable to have a clear idea about it.

i) Ratings of product i.e. Excellent,good,fair, worse.

ii) Grades in exam i.e. A,B,C,D and F.

iii) Ranks in army.

iv) Ranks in sports team.

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$650 is invested in an account earning 8.6% interest (APR), compounded monthly. Write a function showing the value of the accoun
IRISSAK [1]

Answer:

The value of the acount after t years is of A(t) = 650(1.0072)^{12t}

The annual growth rate is of 0.72%.

Step-by-step explanation:

Compound interest:

The compound interest formula is given by:

A(t) = P(1 + \frac{r}{n})^{nt}

Where A(t) is the amount of money after t years, P is the principal(the initial sum of money), r is the interest rate(as a decimal value), n is the number of times that interest is compounded per year and t is the time in years for which the money is invested or borrowed.

$650 is invested in an account earning 8.6% interest (APR), compounded monthly.

This means that P = 650, r = 0.086, n = 12. So

A(t) = P(1 + \frac{r}{n})^{nt}

A(t) = 650(1 + \frac{0.086}{12})^{12t}

A(t) = 650(1.0072)^{12t}

The value of the acount after t years is of A(t) = 650(1.0072)^{12t}

Annual growth rate

1.0072 - 1 = 0.0072 = 0.72%

The annual growth rate is of 0.72%.

5 0
3 years ago
Mitchel poured the contents of a completely filled come into an empty cylinder and the cylinder became two-thirds full. The cyli
-BARSIC- [3]
Multiply 4 and 16 to get 60 then subtract that by 36
8 0
3 years ago
How to round 7,298,341 to the nearest 10,000
yuradex [85]
You first look at the 10,000 places, in this number, the tens place is 90,000. Which is the 9. So you look at the thousands place and check of its 5 or more which means you have to change number or if its 4 or less than leave it. And the thousands place is 8,000 so the 9 has to become greater. So for my thinking, its 7,308,341. My best try
3 0
3 years ago
If x varies directly with y and y is 10 when x is 8, what is x when y is 18?
swat32
Knowing that x varies directly with y, we know the basic skeleton of the equation is y = mx. 

To find m, plug in the known coordinate (8,10), where the x-coordinate is 8 and the y-coordinate is 10.
y=mx \\ 10=m8 \\ (10)/8=(8m)/8 \\ m= \frac{10}{8} = \frac{5}{4}

Then, plug in m to the equation to get y = (5/4)x.

Finally, plug in the y-coordinate 18 to the equation and solve for x!
y= \frac{5}{4}x \\ 18= \frac{5}{4}x \\  \frac{4}{5}(18)=( \frac{5}{4}x) \frac{4}{5} \\ x= \frac{4*18}{5}  \\  x= \frac{72}{5}

Your exact answer is x = 72/5. However, if your teacher prefers decimals, then x = 14.4

Hope this helps!
5 0
3 years ago
Read 2 more answers
(4x+1)(3x-7) yup it hurts
musickatia [10]

Answer:

12x^2-25x-7

Step-by-step explanation:

Multiply each term by its counterpart in the parenthesis.

4x*3x and 4x*-7

1*3x and 1*-7

This gives you 12x^2-4x*7+3x-7 when the like terms are combined.

Collect the like terms, which will give you 12x^2-25x-7

7 0
2 years ago
Read 2 more answers
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