Question

**O Baby!** The weights of 3-month-old baby girls
are normally distributed with a mean of 12.9 pounds and a standard
deviation of 1.6. In an inner city pediatric facility, a random
sample of 16 3-month-old baby girls was selected and their weights
were recorded.

a. What is the probability that the average weight of the 16 baby girls is more than 14 pounds?

b. What is the probability that the average weight of the 16 baby girls is less than 11 pounds?

c. If the average weight of the 16 girls at this inner city pediatric facility was 11 pounds, what conclusions might you draw? Explain.

Answer #1

Baby weights: Following are weights, in pounds, of 11
two–month–old baby girls. It is reasonable to assume that the
population is approximately normal.
12.23
12.32
11.87
12.34
12.66
8.51
14.13
12.95
10.30
9.34
8.63
(a) Construct a
99
%
confidence interval for the mean weight of two–month–old
baby girls.
(b) According to the National Health Statistics Reports,
the mean weight of two–month–old baby boys is
11.1
pounds. Based on the confidence interval, is it
reasonable to believe that the mean...

: Following are weights, in pounds, of
11
two-month-old baby girls. It is reasonable to assume that the
population is approximately normal.
12.34
9.34
8.51
11.87
8.63
12.32
12.23
12.95
10.30
11.48
8.51
Construct a
99.8%
interval for the mean weight of two-month-old baby girls. Round
the answers to three decimal places.

In a random sample of 12 two-month-old baby girls, the sample
mean weight was 11.40 pounds and the population standard deviation
was 1.80 pounds. Assume that the population of weights for
two-month old baby girls is approximately normal.
a) Construct a 98% confidence interval for the population mean
weight of two-month-old baby girls. Be sure to include the
following:
The formula that’s used to calculate the confidence
interval.
If you used a built-in calculator program to compute the lower
and...

1. In a random sample of 12 two-month-old baby girls, the sample
mean weight was 11.40 pounds and the population standard deviation
was 1.80 pounds. Assume that the population of weights for
two-month old baby girls is approximately normal.
a) Construct a 98% confidence interval for the population mean
weight of two-month-old baby girls. Be sure to include the
following:
The formula that’s used to calculate the confidence
interval.
If you used a built-in calculator program to compute the lower...

Suppose birth weights of human babies are normally distributed
with a mean of 120 ounces and a stdev of 16 ounces (1lb = 16
ounces).
1. What is the probability that a baby is at least 9 lbs 11
ounces? 2. What is the probability that a baby weighs less than 10
lbs (160 ounces)? 3. What weight is the 90th percentile?

Suppose that the birth weights of infants are Normally
distributed with mean 120 ounces
and a standard deviation of 18 ounces. (Note: 1 pound = 16
ounces.)
a) Find the probability that a randomly selected infant will
weight less than 5 pounds.
b) What percent of babies weigh between 8 and 10 pounds at
birth?
c) How much would a baby have to weigh at birth in order for
him to weight in the top
10% of all infants?
d)...

baby weights: the weight of male babies less than 2 months old
in the United States is normally distributed with mean 11.5 pounds
and a standard deviation of 2.5 pounds. what portion of the babies
weigh between 9 and 14 pounds?

Baby weights: the weight of male babies less than 2 months old
in the United States is normally distributed with mean 11.5 pounds
and standard deviation 2.5 pounds What proportion of babies weigh
more than 13 pounds? What proportion of babies weigh less than 15
pounds? What proportion of babies weigh between 9 and 14 pounds? Is
it unusual for a baby to weigh more than 15 pounds? Round 4
places

Question 5:
Baby weights: The weight of male babies less
than
2
months old in the United States is normally distributed with
mean
11.6
pounds and standard deviation
2.8
pounds. Use the TI-84 Plus calculator to answer the
following.
(a) What proportion of babies weigh more than
13
pounds?
(b) What proportion of babies weigh less than
15
pounds?
(c) What proportion of babies weigh between
9
and
13.2
pounds?
(d) Is it unusual for a baby to weigh more...

1. The weights of 9 year old male children are normally
distributed population with a mean of 73 pounds and a standard
deviation of 12 pounds. Determine the probability that a random
sample of 21 such children has an average less than 72
pounds.
Round to four decimal places.
2. A normally distributed population has a mean of 80 and a
standard deviation of 17. Determine the probability that a random
sample of size 26 has an average greater than...

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