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3 years ago

How many lines are symmetry

Mathematics

2 answers:

VladimirAG [237]3 years ago

6 0

Answer:

specify which shape's symmetry do you want

Snowcat [4.5K]3 years ago

5 0

What is the picture of the question

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A survey was conducted to determine the average age at which college seniors hope to retire in a simple random sample of 101 sen

tatyana61 [14]

Answer:

96% confidence interval for desired retirement age of all college students is [54.30 , 55.70].

Step-by-step explanation:

We are given that a survey was conducted to determine the average age at which college seniors hope to retire in a simple random sample of 101 seniors, 55 was the average desired retirement age, with a standard deviation of 3.4 years.

Firstly, the Pivotal quantity for 96% confidence interval for the population mean is given by;

P.Q. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample average desired retirement age = 55 years

$\sigma$ = sample standard deviation = 3.4 years

n = sample of seniors = 101

$\mu$ = true mean retirement age of all college students

Here for constructing 96% confidence interval we have used One-sample t test statistics as we don't know about population standard deviation.

So, 96% confidence interval for the population mean, $\mu$ is ;

P(-2.114 < $t_1_0_0$ < 2.114) = 0.96 {As the critical value of t at 100 degree

of freedom are -2.114 & 2.114 with P = 2%}

P(-2.114 < $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ < 2.114) = 0.96

P( $-2.114 \times {\frac{s}{\sqrt{n} } }$ < ${\bar X-\mu}$ < $2.114 \times {\frac{s}{\sqrt{n} } }$ ) = 0.96

P( $\bar X-2.114 \times {\frac{s}{\sqrt{n} } }$ < $\mu$ < $\bar X+2.114 \times {\frac{s}{\sqrt{n} } }$ ) = 0.96

96% confidence interval for $\mu$ = [ $\bar X-2.114 \times {\frac{s}{\sqrt{n} } }$ , $\bar X+2.114 \times {\frac{s}{\sqrt{n} } }$ ]

= [ $55-2.114 \times {\frac{3.4}{\sqrt{101} } }$ , $55+2.114 \times {\frac{3.4}{\sqrt{101} } }$ ]

= [54.30 , 55.70]

Therefore, 96% confidence interval for desired retirement age of all college students is [54.30 , 55.70].

7 0

3 years ago

5x + 3 < -7 you have to show work

OLEGan [10]

Answer:

gev5y

Step-by-step explanation:

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3 years ago

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Did he watch the whole movie

valentinak56 [21]

No, he has not watched the whole movie. The answer would be D. he only has 2/15 to watch.

Hope I helped!

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3 years ago

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There are four people on a committee and each person will be assigned a different job...president, vice president, secretary

melomori [17]

Because there are four people on the committee, and four positions, you would do 4 times 4 which gets you an answer of 16. hope this helps!!

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2 years ago

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If the price for 12 cookies is 42 dollars how much would if cost for 1 cookie

Andrews [41]

Answer:

$3.50

Step-by-step explanation:

42 divided by 12 is the price of one cookie.

42 divided by 12 = $3.50

hope this helps :)

7 0

3 years ago