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hram777 [196]
3 years ago
10

Luc randomly selected 40 students and asked them whether they had ever gone snowboarding. He repeated this survey using the same

method three more times.
Do any of the surveys appear to be biased?

Ever gone snowboarding? Survey
1 2 3 4
Yes 10 13 2 12
No 30 27 38 28


A.
Yes, because the results from Survey 3 differ significantly from results from Surveys 1, 2, and 4, which agree.

B.
Yes, because all four surveys do not have identical results.

C.
No, because although the results differ among the four surveys, the sample method used for all was the same.

D.
No, because all four surveys have about the same number of people saying “yes” and about the same number of people saying “no.”
Mathematics
1 answer:
anygoal [31]3 years ago
7 0
<span>C. No, because although the results differ among the four surveys, the sample method used for all was the same. Luc RANDOMLY selects 40 students in every survey. Random selection in surveys do not create bias and the results are highly credible. This is because there are no preconceived notions or factors that affect the responses of people being surveyed.</span>
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Answer:

y=-2x^2+10x-12

Step-by-step explanation:

graph is shown in image below

4 0
2 years ago
A rectangular table is fivetimes as long as it is wide. if the area is 80ftsquared​,find the length and the width of the table.
SOVA2 [1]
A = L * W
A = 80
L = 5W

80 = W(5W)
80 = 5W^2
80/5 = W^2
16 = W^2
sqrt 16 = W
4 = W <=== width is 4 ft

L = 5W
L = 5(4)
L = 20 <=== length is 20 ft
3 0
2 years ago
A consumer charges a $50 purchase on a credit card. The card has a daily interest rate of 0.038%. If the consumer pays off the b
Mariana [72]

Answer:

SIMPLE ONE-TIME INTEREST

I

=

P

0

r

A

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+

I

=

P

0

+

P

0

r

=

P

0

(

1

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I is the interest

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P0 is the principal (starting amount)

r is the interest rate (in decimal form. Example: 5% = 0.05

Step-by-step explanation:

4 0
2 years ago
Q7 Find the missing angle x
Kryger [21]

Answer:

Step-by-step explanation:

Thales theorem tells us that B is a 90

and therefore from W to o (center) is 45°

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7 0
3 years ago
A basketball player, standing near the basket to grab a rebound, jumps 66.1 cm vertically. How much time does the player spend i
Zepler [3.9K]

Answer:

0.293 s

Step-by-step explanation:

Using equations of motion,

y = 66.1 cm = 0.661 m

v = final velocity at maximum height = 0 m/s

g = - 9.8 m/s²

t = ?

u = initial takeoff velocity from the ground = ?

First of, we calculate the initial velocity

v² = u² + 2gy

0² = u² - 2(9.8)(0.661)

u² = 12.9556

u = 3.60 m/s

Then we can calculate the two time periods at which the basketball player reaches ths height that corresponds with the top 10.5 cm of his jump.

The top 10.5 cm of his journey starts from (66.1 - 10.5) = 55.6 cm = 0.556 m

y = 0.556 m

u = 3.60 m/s

g = - 9.8 m/s²

t = ?

y = ut + (1/2)gt²

0.556 = 3.6t - 4.9t²

4.9t² - 3.6t + 0.556 = 0

Solving the quadratic equation

t = 0.514 s or 0.221 s

So, the two time periods that the basketball player reaches the height that corresponds to the top 10.5 cm of his jump are

0.221 s, on his way to maximum height and

0.514 s, on his way back down (counting t = 0 s from when the basketball player leaves the ground).

Time spent in the upper 10.5 cm of the jump = 0.514 - 0.221 = 0.293 s.

5 0
3 years ago
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