Question
In: Statistics and Probability
On the planet of Mercury, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised...
On the planet of Mercury, 4-year-olds average 3 hours a day
unsupervised. Most of the unsupervised children live in rural
areas, considered safe. Suppose that the standard deviation is 1.4
hours and the amount of time spent alone is normally distributed.
We randomly survey one Mercurian 4-year-old living in a rural area.
We are interested in the amount of time X the child spends alone
per day. (Source: San Jose Mercury News) Round all answers to 4
decimal places where possible.
a. What is the distribution of X? X ~ N(,)
b. Find the probability that the child spends less than 3.1 hours
per day unsupervised.
c. What percent of the children spend over 2.2 hours per day
unsupervised. % (Round to 2 decimal places)
d. 84% of all children spend at least how many hours per day
unsupervised? hours.
Solutions
Expert Solution
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orchestra answered 1 year agoRelated Solutions
On the planet of Mercury, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised...
On the planet of Mercury, 4-year-olds average 3 hours a day
unsupervised. Most of the unsupervised children live in rural
areas, considered safe. Suppose that the standard deviation is 1.4
hours and the amount of time spent alone is normally distributed.
We randomly survey one Mercurian 4-year-old living in a rural area.
We are interested in the amount of time X the child spends alone
per day. (Source: San Jose Mercury News) Round all answers to 4
decimal places where...
On the planet of Mercury, 4-year-olds average 2.9 hours a day unsupervised. Most of the unsupervised...
On the planet of Mercury, 4-year-olds average 2.9 hours a day
unsupervised. Most of the unsupervised children live in rural
areas, considered safe. Suppose that the standard deviation is 1.5
hours and the amount of time spent alone is normally distributed.
We randomly survey one Mercurian 4-year-old living in a rural area.
We are interested in the amount of time X the child spends alone
per day. (Source: San Jose Mercury News) Round all answers to 4
decimal places where...
On the planet of Mercury, 4-year-olds average 3.1 hours a day unsupervised. Most of the unsupervised...
On the planet of Mercury, 4-year-olds average 3.1 hours a day
unsupervised. Most of the unsupervised children live in rural
areas, considered safe. Suppose that the standard deviation is 1.7
hours and the amount of time spent alone is normally distributed.
We randomly survey one Mercurian 4-year-old living in a rural area.
We are interested in the amount of time X the child spends alone
per day. (Source: San Jose Mercury News) Round all answers to 4
decimal places where...
On the planet of Mercury, 4-year-olds average 3.1 hours a day unsupervised. Most of the unsupervised...
On the planet of Mercury, 4-year-olds average 3.1 hours a day
unsupervised. Most of the unsupervised children live in rural
areas, considered safe. Suppose that the standard deviation is 1.7
hours and the amount of time spent alone is normally distributed.
We randomly survey one Mercurian 4-year-old living in a rural area.
We are interested in the amount of time X the child spends alone
per day. (Source: San Jose Mercury News) Round all answers to 4
decimal places where...
On the planet of Mercury, 4-year-olds average 2.8 hours a dayunsupervised. Most of the unsupervised...
On the planet of Mercury, 4-year-olds average 2.8 hours a day
unsupervised. Most of the unsupervised children live in rural
areas, considered safe. Suppose that the standard deviation is 1.5
hours and the amount of time spent alone is normally distributed.
We randomly survey one Mercurian 4-year-old living in a rural area.
We are interested in the amount of time X the child spends alone
per day. (Source: San Jose Mercury News) Round all answers to 4
decimal places where...
4. In China, six-year old children average three hours per day of unsupervised activity (not including...
4. In China, six-year old children average three hours per day
of unsupervised activity (not including sleep/rest times). Most of
the unsupervised children live in very rural areas that are
considered to be quite safe. Suppose that the time spent alone is
normally distributed with a standard deviation of 0.5 hours. Based
on this information, … b. What is the probability that a child in
this study will spend between 2.5 and 3.5 hours per day in
unsupervised activity? c....
3. A consumer watchdog group is studying the number of hours 10-year-olds watch television each day. ...
3. A consumer watchdog group is studying the number of hours
10-year-olds watch television each day. A random sample
of 25 household containing at least one 10-year-old were surveyed.
The parents were asked to record the number of hours the
10-year-old watched television on Saturday, including video games
and YouTube.
Mean number of hours watching Television was determined to be 6
and the population standard deviation is known to be 5 hours.
What type of data are these? Explain.
Can...
The table below gives the number of hours spent unsupervised each day as well as the...
The table below gives the number of hours spent unsupervised
each day as well as the overall grade averages for seven randomly
selected middle school students. Using this data, consider the
equation of the regression line, yˆ=b0+b1x, for predicting the
overall grade average for a middle school student based on the
number of hours spent unsupervised each day. Keep in mind, the
correlation coefficient may or may not be statistically significant
for the data given. Remember, in practice, it would...
The table below gives the number of hours spent unsupervised each day as well as the...
The table below gives the number of hours spent unsupervised
each day as well as the overall grade averages for seven randomly
selected middle school students. Using this data, consider the
equation of the regression line, yˆ=b0+b1x, for predicting the
overall grade average for a middle school student based on the
number of hours spent unsupervised each day. Keep in mind, the
correlation coefficient may or may not be statistically significant
for the data given. Remember, in practice, it would...
The table below gives the number of hours spent unsupervised each day as well as the...
The table below gives the number of hours spent unsupervised
each day as well as the overall grade averages for seven randomly
selected middle school students. Using this data, consider the
equation of the regression line, yˆ=b0+b1x, for predicting the
overall grade average for a middle school student based on the
number of hours spent unsupervised each day. Keep in mind, the
correlation coefficient may or may not be statistically significant
for the data given. Remember, in practice, it would...
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