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Anastaziya [24]
3 years ago
7

Whole numbers are written on cards and then placed in a bag. Tyra selects a single card, writes down the number. and then placed

it back in the bag. She repeats this 62 times.
Tyra calculates the relative frequency of each number card

Which statement about Tyra's experiment is true?

A. The out comes do not appear to be equally likely, so a uniform
probability model is a good
to represent the probabilities in Tyra's experiment.

B. The outcomes do not appear to be equally likely, so a uniform propabililty model is not good model to represent the probabilities in Tyra's experiment

C. The outcomes do not appear to be equally likely, so a uniform probability model IS not good modelto repersent the probabilities in Tyra's experiment.

C. The outcomes appear to be equally likely, so a uniform probability model is a good model to repersent the probabilities in Tyra's experiment.

D. The outcomes appear to be equally likely, so a uniform probability model is not good model to represent the propabililtes in Tyra's experiment.

Mathematics
1 answer:
wariber [46]3 years ago
3 0
The tables shows that the relative frequencies for each number are very similar 0.19, 0.20 and 0.21.

That drives to tell that the outcomes appear to be equally like.

That means that the probabilities are uniform, so the answer is:
<span>The outcomes appear to be equally likely, so a uniform probability model is a good model to repersent the probabilities in Tyra's experiment.</span>
 

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Consider a t distribution with 7 degrees of freedom. Compute P(-1.29 &lt; t &lt; 1.29). Round your answer to at least three deci
ss7ja [257]

Answer:

a) 0.76197086

b) -1.73406361

Step-by-step explanation:

a)

Consider a t distribution with 7 degrees of freedom. Compute P(-1.29 < t < 1.29)

P(-1.29 < t < 1.29) would be the area under the t distribution curve with 7 degrees of freedom between -1.29 and 1.29, that is in the interval (-1.29, 1.29).

This can be done the old style by looking up in a table or by using the technology with a spreadsheet.

In Excel, the function TDIST(x,n,2) with x>0 gives the area outside the interval (-x, x) of the t distribution with n degrees of freedom.

So TDIST(1.29,7,2) gives the area outside (-1.29, 1.29).

If we subtract this value from 1 we get the desired result

Hence  

P(-1.29 < t < 1.29) = 1 - TDIST(1.29,7,2) = 1 - 0.23802914 = 0.76197086

In OpenOffice Calc, the function is the same replacing “,” with “;”  

That is

P(-1.29 < t < 1.29) = 1 - TDIST(1.29;7;2) = 0.76197086

b)

Consider a t distribution with 18 degrees of freedom. Find the value of c such that P(t≤ c) = 0.05

We are looking for a point c such that the area of the t distribution with 18 degrees of freedom to the left of c is 0.05

In Excel, the inverse function of TDIST is TINV.  

TINV(p*2,n) with p>0 gives the point c such that the area of the t distribution with n degrees of freedom to the right of c is p.  

Since <em>the t distribution is symmetric with respect to 0</em>, -c would be a point such that the area to the left of -c is p.

So we want to compute  in Excel

-TINV(0.05*2,18) = -1.73406361

In OpenOffice Calc  

-TINV(0.05*2;18) = -1.73406361

3 0
2 years ago
I don't know what's it asking me. what should I do?
Anton [14]
n - a number
n^2 - its square
n+n^2 - the sum
\leq - less than or equal
negative three - I don't have to explain this one, do I?

n+n^2\leq-3 - the sum of a number and its square is less than or equal negative three



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