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Marina CMI [18]
3 years ago
7

A recent study found that the death rate for people who sleep 6 to 7 hours per night is lower than the death rate for people who

sleep 8 or more hours. The 1.1 million observations used for this study came from a random survey of Americans aged 30 to 102. Each survey respondent was tracked for 4 years. The death rate for people sleeping 7 hours was calculated as the ratio of the number of deaths over the span of the study among people sleeping 7 hours to the total number of survey respondents who slept 7 hours. This calculation was then repeated for people sleeping 6​ hours, and so on. Based on this​ summary, would you recommend that Americans who sleep 9 hours per night consider reducing their sleep to 6 or 7 hours if they want to prolong their​ lives
Business
1 answer:
padilas [110]3 years ago
6 0

Answer:

Yes, I would recommend those sleeping 9 hours to consider sleeping 6 or 7 hours.

Explanation:

First of all, the sample of the study is very representative because the amount of observations is quite big: 1.1 million!. This means that the results of the study have a very low margin of error, and therefore, can be trusted.

Secondly, the calculations are simple, but correct. The easiest way to determine the mortality rate is to divide the number of people who died by the number of people who are still living, and who belong to the same sample.

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4 0
3 years ago
Traditionally, department stores almost exclusively offered soft goods. But now, most department stores focus on selling both ha
Studentka2010 [4]

Answer:

False

Explanation:

Traditionally, department stores sold both soft goods and hard goods. But now, most department stores focus almost exclusively on soft goods.

Soft goods refers generally to clothing and other textiles like bedding and fabrics.

Hard goods refers to a broad range of products like appliances, furniture, tools, electronics, etc.

5 0
2 years ago
The weekly incomes of shift foreman for a given industry follow a normal probability distribution. With a mean of $1,000 and a s
mylen [45]

Answer:

There is a 0.2419% for a foreman to earn either $1,100 or $900

Explanation:

We calculate the probability of a normal distribution of 0;1

(X-mean)/deviation = Z

(1,100 - 1,000)/100 = 100/100 = 1

900 - 1,00/100 = -100/100 = -1

Given the zame Z value, we have the same probability of a foreman to earn 1,100 or 900

As we are asked for the foreman salary, wewill calcualte the Z for non cumulative, just the probability of a foreman to earn 1,100 or 900 dollars.

We look into the normal distribution table for the value of z = -1 or 1

0.002419707  = 0.2419%

4 0
3 years ago
Suppose that a planet fitness studio has fixed expenses of $7500 per month and variable expenses of $4.99 per member per month.
natka813 [3]
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6 0
3 years ago
Holy macaroni! That's Almost It!
IrinaK [193]

Answer:

Virtually all of the 7 million millionaires in the United States learned how to make smart decisions by doing their homework.

Answer: Option 7.

Explanation:

6 0
2 years ago
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