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grin007 [14]
3 years ago
8

Let x be a random variable representing the amount of sleep each adult in New York City got last night. Consider a sampling dist

ribution of sample means x. (a) As the sample size becomes increasingly large, what distribution does the x distribution approach? uniform distribution sampling distribution normal distribution binomial distribution (b) As the sample size becomes increasingly large, what value will the mean μx of the x distribution approach? μx μ μ/√n μ/n σ (c) What value will the standard deviation σx of the sampling distribution approach? σ/n σx σ/√n μ σ (d) How do the two x distributions for sample size n = 50 and n = 100 compare? (Select all that apply.) The standard deviations are μ / 50 and μ / 100, respectively. The means are the same. The standard deviations are the same. The standard deviations are σ / √50 and σ / √100, respectively. The standard deviations are μ / √50 and μ / √100, respectively. The standard deviations are σ / 50 and σ / 100, respectively.
Mathematics
2 answers:
Sonbull [250]3 years ago
8 0

Answer:

a) As the sample size becomes increasingly large, the distribution approximates a normal distribution.

b) As the sample size becomes increasingly large, the mean of the sampling distribution, μₓ, approach as the population mean, μ.

σₓ

c) The standard deviation of the sampling distribution is given as

σₓ = (σ/√n)

d) Two sampling distributions with Sample size 50 and 100 have standard deviation of sampling distribution of (σ/√50) and (σ/√100) respectively.

Step-by-step explanation:

The Central limit theorem explains that sample distributions obtained from a population distribution (especially normally distributed ones) have distributions that approximate a normal distribution, a mean that is equal to the population mean and a standard deviation of sampling distribution given as the population standard deviation divided by square root of sample size.

a) Just like the Central limit theorem explains, as the sample size becomes increasingly large, the distribution approximates a normal distribution

b) And as the sample size becomes increasingly large, the mean of the sampling distribution, μₓ, approach as the population mean, μ.

c) The standard deviation of the sampling distribution is given as the population standard deviation divided by square root of sample size.

d) Using the formula given in (c) above, the standard deviation of sampling distribution of two sampling distributions with sample size 50 and 100 are (σ/√50) and (σ/√100) respectively.

Hope this Helps!!!

dangina [55]3 years ago
4 0

Answer:

Step-by-step explanation:

Given that X is a random variable representing the amount of sleep each adult in New York City got last night.

a) Normal distribution (by central limit theorem)

b) Sample mean will approach population mean mu

c) the standard deviation σx of the sampling distribution approach to σ/√n

d)  The means are the same.

. The standard deviations are σ / √50 and σ / √100, respectively.

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The funcilon f(x) = -(x + 5)(x +
Arte-miy333 [17]

Answer:

all numbers less than or equal to -3.

Step-by-step explanation:

The original equation shown is in "root form", a form of a quadratic equation showing where it hits the x-axis. This form does not show, like a "standard form" quadratic equation does, the vertex of the quadratic. The standard form equation is shown below.

ax^2+bx+c

  1. a is a constant showing the vertical stretch or compression of the quadratic. Also it can show if the function is flipped based on if it has a negative symbol at the front.
  2. b isn't very important when graphing unless you want to convert the equation to root-form.
  3. c is the height of the vertex. This is very important to know for this question because the vertex is either the minimum or maximum of the quadratic.

If we want to solve this equation showing all our work, the best bet is converting our equation from root-form to standard-form, like so:

f(x)=-(x+5)(x+1)

  • distribute x and 5 into (x+1). Then take this and distribute the negative sign.

f(x)=-x^2-5x-x-5\\f(x)=-x^2-6x-5

  • This is our standard-form of the quadratic. Now we just need to determine the range of y values it has.
  • <em>Note: The answers are wrong based on the c value I have for this equation, so I'm going to just give the answer closest to this one.</em>

Based on the properties of a standard form equation I gave earlier, this equation will look like an upside down "U" with a maximum value of -5. Therefore (based on the <em>italicized </em>text above), the range of y values for this equation must be "all real numbers less than or equal to -3".

P.S: Message me with any questions or fixes I should make to my math.

7 0
3 years ago
Round 4,589 to the thousands
AleksandrR [38]
That would be 5,000.


3 0
4 years ago
Read 2 more answers
-16-4 = ?<br> 4.? =<br> 4.<br> So, -16-4=
PIT_PIT [208]

Answer:

It's -16-4

Step-by-step explanation:

Therefore its negative mins a neg so its like a debt mins a debt so it remains a debt.

Therefore its- 20

Plzzz brainlest

4 0
3 years ago
Read 2 more answers
Pls answer this with work. its in the picture
defon

Answer:

180 pages

Step-by-step explanation:

First you find the slope of the line assuming this is linear. it's just the Rise over Run. so go up 4 over 2 which means the slope is going up two. so do 90 times 2 which is 180. That means Jeff read 180 pages.

3 0
3 years ago
An ice cream vendor sells three flavors: chocolate, strawberry, and vanilla. Forty five percent of the sales are chocolate, whil
olganol [36]

Answer:


Step-by-step explanation:

Sales of the chocolate ice cream is 45%, 30% for strawberry and 25% (100%-45%-30%) of vanilla.

Percentages of cone sales for chocolate, strawberry and vanilla are 75%, 60% and 40%respectively.

A. Probability chocolate chosen: 45%=0.45

B. Probability strawberry chosen: 30%=0.30

C. Probability vanilla chosen:25%=0.25

D. Probability ice cream on a cone: 75%×45%+60%×30%+40%×25%

                                                          =0.75×0.45+0.60×0.30+0.40×0.25

                                                          =0.3375+0.18+0.1

                                                          =0.6175

E. Probability ice cream in a cup: 1- Probability ice cream in a cone

                                                     =1-0.6175

                                                     =0.3825

Probability that the ice cream sold on a cone and was strawberry flavoured is : 30%×60%

=0.30×0.60

=0.18

3 0
3 years ago
Read 2 more answers
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