Question
In: Statistics and Probability
A marketing research company desires to know that mean consumption of milk per week among people...
A
marketing research company desires to know that mean consumption of
milk per week among people over age 31. They believe that the milk
consumption has a mean of 4.6 L I want to construct a 90%
confidence interval with the maximum error of 0.08 L. Assuming you
variance of 0.81 L what is the minimum number of people over age 31
they must include in their sample round your answer up to the next
integer
Solutions
orchestra answered 2 years agoRelated Solutions
A marketing research company desires to know the mean consumption of milk per week among males...
A marketing research company desires to know the mean
consumption of milk per week among males over age 3232. A sample of
710710 males over age 3232 was drawn and the mean milk consumption
was 4.64.6 liters. Assume that the population standard deviation is
known to be 0.80.8 liters. Construct the 98%98% confidence interval
for the mean consumption of milk among males over age 3232. Round
your answers to one decimal place.
A marketing research company desires to know the mean consumption of milk per week among males...
A marketing research company desires to know the mean
consumption of milk per week among males over age 22. A sample of
715 males over age 22 was drawn and the mean milk consumption was
4.2 liters. Assume that the population standard deviation is known
to be 1.3 liters. Construct the 90% confidence interval for the
mean consumption of milk among males over age 22. Round your
answers to one decimal place.
a marketing research company desires to know the mean consumption of potatoes per week among people...
a marketing research company desires to know the mean
consumption of potatoes per week among people over age 49. They
believe that potatoes consumption has a mean of 4.2 pounds and want
to construct a 95% confidence interval with a maximum error of .05
pounds. Assuming a variance of 1.44 pounds, what is the minimum
number of people over age 49 they must include in their sample?
A)1960
B)2401
C)49
D)2213
E)297
The mean per capita consumption of milk per year is 131 liters with a variance of...
The mean per capita
consumption of milk per year is 131 liters with a variance of
841.
If a sample of 132
people is randomly selected, what is the probability that the
sample mean would be less than 133.5 liters? Round your
answer to four decimal places.
The mean per capita consumption of milk per year is 133 liters with a variance of...
The mean per capita consumption of milk per year is 133 liters
with a variance of 576.
If a sample of 195 people is randomly selected, what is the
probability that the sample mean would differ from the true mean by
less than 3.62 liters? Round your answer to
four decimal places.
A tele-marketing company wants to know if sales go up as they call more people per...
A tele-marketing company wants to know if sales go up as they
call more people per day but spend less time per call. The
following is the data from nine randomly selected days. The
information is the number of calls the salesperson makes in a day
and the total amount of sales (in thousands of dollars).
Calls
25 29
33 37
43 48
52 55
67
Sales
3.7 4.2
4.2 5.0
4.7 5.3
4.9 5.6 5.9
a. Calculate ∑X, ∑X2,...
The mean volume of customer traffic in a new store is 927 people per week with...
The mean volume of customer traffic in a new store is 927 people
per week with a standard deviation of 86. Answer the following
questions based on these data. Write out what P() would be for
each.
a. What is the probability that more than 1,000 customers visit
the store in a given week?
b. What is the probability that less than 800 customers visit
the store in a given week?
c. What is the probability that between 900 and...
A political polling company wants to know if there are differences among people of different political...
A political polling company wants to know if there are
differences among people of different political parties with
respect to their views on a bill recently proposed in Congress. The
company conducted a survey of 300 people and got the following
results. Do the results support the hypothesis that there are
differences among people in different political parties regarding
their views on this bill? (Use a = 0.10)
Republicans
Democrats
Independents
Strongly Agree
50
10
20
Agree
20
10
15...
A researcher desires to know whether the typing speed of a secretary (in words per minute)...
A researcher desires to know whether the typing speed of a
secretary (in words per minute) is related to the time (in hours)
that it takes the secretary to learn to use a new word processing
program. The data are shown.
Speed x
Time y
48
7
74
4
52
8
79
3.5
83
2
56
6
85
2.3
63
5
88
2.1
74
4.5
90
1.9
92
1.5
If there is a significant relationship, predict the time it will...
1. A researcher desires to know whether the typing speed of a secretary (in words per...
1. A researcher desires to know whether the typing speed of a
secretary (in words per minute) is related to the time (in hours)
that it takes the secretary to learn to use a new word processing
program. The data are shown below. Speed 48 74 52 79 83 56 85 63 88
74 90 92 Time 7 4 8 3.5 2 6 2.3 5 2.1 4.5 1.9 1.5 First, make a
scatter plot of the data. Next, find the...
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