All categories

3 years ago

The variance of a sample of 121 observations equals 441. The standard deviation of the sample equals 1.91. 231. 21. 11.

Business

1 answer:

Cloud [144]3 years ago

6 0

The standard deviation of sample equals: 11

Explanation:

Given:

variance of sample ( $S^{2}$ ) = 121

no, of observations made = 441

standard deviation = ?

By using the formula:

Standard deviation (S) = $\sqrt{variance}$

= $\sqrt{S}$

= $\sqrt{121}$

= 11

Hence the standard deviation is equal to 11.

You might be interested in

HELP ME PLS ASAP PPSLSPLSPSSLSPS

klio [65]

It’s really blurry i can’t see

8 0

3 years ago

Read 2 more answers

Suppose that Fizzo and Pop Hop are the only two firms that sell orange soda. The following payoff matrix shows the profit (in mi

Serga [27]

Solution :

It is given that Fizzo and Pop Hop sells orange soda. Fizzo advertises about his drinks while Pop Hop does not advertises.

According to the matrix provided we can conclude that :

-- If Fizzo wishes to advertise about his soda drinks, he will earn a profit of 8 million dollar and if Pop Hop do advertises and a 15 million dollar if Pop Hop does not advertises.

-- If Fizzo does not advertise, it will earn profit of about 2 million dollar if Pop Hop advertises and 9 million dollar if Pop Hop does not advertises.

-- When Pop Hop wished to advertise , Fizzo will make a higher profit if he chooses to advertise.

-- When Pop Hop do not advertise, Fizzo will make a higher profit when it chooses to advertise.

And if both the firms acts independently and they start off not advertising, then --- both firms will advertise as both of them will earn highest profits each.

If both the firms collude and both firms start off not advertising, the strategies they will end up is that both the firms will not advertise as the joint profit will be maximized.

3 0

3 years ago

The Centers for Disease Control and Prevention (CDC) defines a healthy sleep duration

laiz [17]

a. The point estimate of the married people that sleep well is = 0.6299. The confidence interval for the mean hours of sleep for those that have never been married but report good sleep is 0.6186, 0.6412

b. The point estimate of the number of hours for people that have never been married = 7.2257

95% confidence interval for the mean number of hours of sleep for those who have never been married = 7.2065, 7.2447

c. the estimated number of sleep for those that have never been married = 7.729 hours

a. The point estimate

$P=\frac{Xp}{n}$

$Xp = successes\\n = sample size\\$

Those who have never been married n = 7044

Xp = those who sleep for 7 hours at least

To get Xp, the excel function

Countif(range, criteria)

Countif(A:A, >=7)

This gives Xp = 4437

Point estimate =

$\frac{4477}{7044}$

= 0.6299

The point estimate of the married people that sleep well is = 0.6299

At 95% interval of confidence,

α = 1-0.95 = 0.05

α/2 = 0.05/2 = 0.025

Z0.025 = 1.96 ( Use the standard probability normal table)

Margin of Error

= $M.E = 1.96\sqrt \frac{0.6299(1-0.6299)}{7044} \\\\= 1.96\sqrt{0.000033} \\\\1.96*0.0057$

= 0.0113

The 95% confidence interval

= 0.6299 - 0.0113 , 0.6299 + 0.0113

= 0.6186, 0.6412

The confidence interval for the mean hours of sleep for those that have never been married is 0.6186, 0.6412

b. Sample mean

x = ∑x/n

x = number of sleep of the never been married

Mean is calculated using excel function

Average(range)

Average(a:a)

This gives the sample mean = 7.2257

The point estimate of the number of hours for people that have never been married = 7.2257

Standard deviation using excel =

Stdev(A:A) = 0.8211

$Margin of error =1.96*\frac{0.8211}{\sqrt{7044} }$

= 0.0192

The confidence interval =

= 7.2257-0.0192, 7.2257+0.0192

= 7.2065, 7.2447

95% confidence interval for the mean number of hours of sleep for those who have never been married = 7.2065, 7.2447

c. From the available data, the mean number of sleep per day that is gotten from the 4437 people that are unmarried and sleep healthily for at least 7 hours = 34295.1

Mean = 34295.1/4437

= 7.729

the estimated number of sleep for those that have never been married = 7.729 hours

6 0

3 years ago

Federal Semiconductors issued 11% bonds, dated January 1, with a face amount of $800 million on January 1, 2021. The bonds sold

BabaBlast [244]

Answer:

calcule estúpido malparido

3 0

3 years ago

A barrel of oil as measured on the oil market is equal to 1.333 u.s. barrels. a u.s. barrel is equal to 31.5 gal. if oil is on t

RoseWind [281]

You need conversion in this problem to solve it. Since you are already given of all the data, you just need to utilize the data to come up with the answer. You simply have to divide the equivalent units of a barrel with the U.S. barrels and further divide it with the equivalent gallons of U.S. barrel. You can get $2.24 ($94 / 31.5 / 1.33).

7 0

3 years ago