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Musya8 [376]
3 years ago
10

SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SA

T score of first year students at your college. If you would like to limit the margin of error of your 98% confidence interval to 40 points, at least how many students should you sample?
Mathematics
1 answer:
kotegsom [21]3 years ago
3 0

Answer:

I should use at least 304 students

Step-by-step explanation:

Margin error (E) = t × sd/√n

E = 40

sd = 300

confidence level (C) = 98% = 0.98

significance level = 1 - C = 1 - 0.98 = 0.02 = 2%

t-value corresponding to 2% significance level and infinity degree of freedom is 2.326

n = (t×sd/E)^2 = (2.326×300/40)^2 = 17.445^2 = 304 (to the nearest integer)

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Four lines are drawn on a coordinate plane to form trapezoid WXYZ. Which statements are true about the lines? Select all that ap
Anastaziya [24]

Given a trapezoid WXYZ. In a trapezoid one pair of opposite sides are parallel .Parallel lines have same slope.Slope of line parallel to x axis is 0.If the line starts at the bottom left and goes towards the top right it has negative slope.

All that is true for Trapezoid WXYZ are:

Line WZ has the same slope as line XY.

Line XW has a lesser slope than line YZ.

Line ZW has the same y-intercept as line WZ.

Line XY has a greater y-intercept



8 0
3 years ago
Read 2 more answers
as a cure to the epidemic that spread in the whole country, the department of health released a new drug that is subject for exp
nlexa [21]

Answer:

Your smart maybe

Step-by-step explanation:

5 0
3 years ago
Ng ne Volume of a Cone
AnnyKZ [126]
Answer: height = 6, radius = 8, Volume = 401.92

Explanation:
Height = 6 given

Find radius:

Use Pythagorean’s theorem to find the side of the right triangle:

a^2 + b^2 = c^2
b^2 = c^2 - a^2
b^2 = 10^2 - 6^2
b^2 = 100-36
b^2 = 64
b = 8

And since length b is also the radius of the circle then radius = 8

Find volume:

V = pi x r^2 x h/3

V = 3.14 x 8^2 x 6/3

V = 3.14 x 64 x 2

V = 401.92
6 0
3 years ago
Permudahkan setiap yang berikut
neonofarm [45]

Answer:

Step-by-step explanation:

\frac{4^{2}*4^{5} }{(4^{6})^{2}}=\frac{4^{2}*4^{5} }{4^{12}}\\\\=4^{2+5-12}=4^{-5}\\\\ =\frac{1}{4^{5}}

5 0
3 years ago
На первых трёх уроках Вася получил по одной оценке: 3, 4 и 5. Дома он сказал: " Пятерку я получил не на третьем уроке. А четверк
Verizon [17]

"Пятерку я получил не на третьем уроке" - ложь. Значит, пятерку Вася получил на третьем уроке.

"Четверку получил на втором" - тоже ложь. Значит, четверку Вася мог получить на перовом или на третьем уроке.

Выше мы выяснили, что на третьем уроке он получил пятерку, следовательно, четверку Вася получил на первом уроке.

Свободны остались только второй урок и тройка.

Ответ: Вася получил тройку на втором уроке.

6 0
4 years ago
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