Hey Guys,
Please help me with my Statistics Problem:
Below are descriptions of a number of different distributions. Indicate which are most likely or least likely to approximate a normal distribution, briefly giving your reasoning in each case.
a) The weekly grocery bill of a family during a year.
b) The reading scores of all Long Island 5th graders this year.
c) The age at which each of 1000 children took their first step.
d) The age at death for each inhabitant of New York State who died in 1983.
e) The daily Dow-Jones Industrial Average during the last month.
f) The incomes of 2 million people selected at random.
Your help would be so appreciated!! :')
Please help me with my Statistics Problem:
Below are descriptions of a number of different distributions. Indicate which are most likely or least likely to approximate a normal distribution, briefly giving your reasoning in each case.
a) The weekly grocery bill of a family during a year.
b) The reading scores of all Long Island 5th graders this year.
c) The age at which each of 1000 children took their first step.
d) The age at death for each inhabitant of New York State who died in 1983.
e) The daily Dow-Jones Industrial Average during the last month.
f) The incomes of 2 million people selected at random.
Your help would be so appreciated!! :')
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a. should approximate a normal dist. There may be weeks where certain foods or items are needed more but they should be minimal so normal
f. 2 million people selected at random is a model for the normal distribution.
c. If randomly selected, this should be very close to normal
d. There would have been a high enough number of deaths in such a big state so the distribution should be normal but with a relatively high standard deviation
b. Since these are only fifth graders and only from 1 area, the distribution should approximate the normal distribution but not as likely to be as the above
e. I highly doubt you could use the word normal with the dow industrial average over such a short period of time.
There is my thoughts. I am a student instructor at a local college in mathematics and statistics. The first two could possibly be interchanged. This is really an opinion question assuming you know the definition of the normal (bell shaped) distribution.
f. 2 million people selected at random is a model for the normal distribution.
c. If randomly selected, this should be very close to normal
d. There would have been a high enough number of deaths in such a big state so the distribution should be normal but with a relatively high standard deviation
b. Since these are only fifth graders and only from 1 area, the distribution should approximate the normal distribution but not as likely to be as the above
e. I highly doubt you could use the word normal with the dow industrial average over such a short period of time.
There is my thoughts. I am a student instructor at a local college in mathematics and statistics. The first two could possibly be interchanged. This is really an opinion question assuming you know the definition of the normal (bell shaped) distribution.