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AleksandrR [38]
2 years ago
8

Can you use mechanical pencils on the PSAT?

Mathematics
1 answer:
TEA [102]2 years ago
7 0

Answer:

no

Step-by-step explanation:

only number 2 pencils im pretty sure

You might be interested in
Use a graph to describe the domain and range of each of the functional sequence below
Y_Kistochka [10]

Answer:

ℝ

Step-by-step explanation:

All linear functions have a <em>range</em> and <em>domain</em> of <em>all real numbers</em>.

I am joyous to assist you anytime.

8 0
2 years ago
Consider the following hypothesis test: H0: μ1 - μ2 = 0 Ha: μ1 - μ2 ≠ 0 There are two independent samples taken from the two pop
nlexa [21]

Answer:

The value of the test statistic is z = 1.78

Step-by-step explanation:

Before finding the test statistic, we need to understand the central limit theorem and subtraction of normal variables.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

Sample 1:

\mu_1 = 110, s_1 = \frac{7.2}{\sqrt{81}} = 0.8

Sample 2:

\mu_2 = 108, s_2 = \frac{6.3}{\sqrt{64}} = 0.7875

The test statistic is:

z = \frac{X - \mu}{s}

In which X is the sample mean, \mu is the value tested at the null hypothesis, and s is the standard error.

0 is tested at the null hypothesis:

This means that \mu = 0

Distribution of the difference:

X = \mu_1 - \mu_2 = 110 - 108 = 2

s = \sqrt{s_1^2+s_2^2} = \sqrt{0.8^2+0.7875^2} = 1.1226

What is the value of the test statistic?

z = \frac{X - \mu}{s}

z = \frac{2 - 0}{1.1226}

z = 1.78

The value of the test statistic is z = 1.78

5 0
3 years ago
Plz help me understand number 20
Alecsey [184]
-2.45 will be the write answer
3 0
2 years ago
Read 2 more answers
Can someone pls help me with number 5 pls show your work so i can understand thanks
Natali [406]

Step-by-step explanation:

Let's represent Aaron's age with x and

Charlene's age with x+8

x+x+8=44

2x+8=44

2x=44-8

2x=36

x=36÷2

x=18

Aaron is 18 years old.

While Charlene is 18+8=26 years old.

<em>Hope this </em><em>helps!</em>

7 0
3 years ago
Simplify the expression -2(p+4)^2-3+5p.What is the simplified expression in standard form?​
Leokris [45]

Answer: -2x²-11x-35

Step-by-step explanation:

-2(p+4)²-3+5p

-2(x²+8x+16)-3+5x

-2x²-11x-35

8 0
2 years ago
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