Question

The average mass of newborn infants born at a given hospital is 3.5 kg with standard deviation of 575 g. Assume these birth weights follow a normal distribution.

(a) What is the probability that a newborn selected randomly from this population has a mass of at least 4.64 kg?

(b) What is the probability that a newborn selected randomly from this population has a mass between 3.3 kg and 3.6 kg?

(c) If 100 infants are born in one day at the given hospital, what is the probability that at least two infants will be born with a mass of at least 4.64 kg?

Answer #2

answered by: anonymous

A hypothesis regarding the weight of newborn infants at a
community hospital is that the mean is 6.6 pounds. A sample of
seven infants is randomly selected and their weights at birth are
recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. If
α = 0.05, what is the critical t-value?
Multiple Choice
−2.365
±1.96
±2.365
±2.447

The weights of newborn baby boys born at a local hospital are
believed to have a normal distribution with a mean weight of 3951
grams and a variance of 60,025 . If a newborn baby boy born at the
local hospital is randomly selected, find the probability that the
weight will be between 3485 and 4147 grams. Round your answer to
four decimal places.

A hypothesis regarding the weight of newborn infants at a
community hospital is that the mean is 6.6 pounds. A sample of
seven infants is randomly selected and their weights at birth are
recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. When
evaluated using the 5% level of significance, which of the
following would be the best decision/interpretation of the null
hypothesis?
A. Fail to reject the null hypothesis.
B. Reject the null hypothesis and conclude the...

4. The mean weight of newborn infants at a community hospital is
6.6 pounds A sample of seven infants is randomly selected and their
weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and
6.6 pounds. Do they really weigh only 6.6 pounds? I thought they
would weigh more.
A. State the hypotheses
b. Find the calculated value of the test statistic
c. State critical value at α = .05
d. State conclusion

Birth weights of newborn babies follow a normal distribution
with mean of 3.39 kg and standard deviation of 0.55 kg. Use a table
of Z ‑critical values to find the probability that a newborn baby
weighs less than 2.125 kg. Give your answer as a percentage rounded
to two decimal places.
Probability:

The weight of a newborn baby is a random variable that follows a
normal distribution with mean =3.2 kg and standard deviation = 0.4
kg.
a) Determine the percentage of newborn babies that weight 3.5 kg
or more
b) Calculate the conditional probability that a newborn baby
weighs more than 3.5 kg if it's known that it at least weights 3
kg.
c) From what weight is found the 10% of the babies that are born
weighing more?

Birth weights of babies born to full-term pregnancies follow
roughly a Normal distribution. At Meadowbrook Hospital, the mean
weight of babies born to full-term pregnancies is 7 pounds with a
standard deviation of 14 ounces (1 pound = 16 ounces).
Dr. Watts (who works at Meadowbrook Hospital) has four deliveries
(all for full-term pregnancies) coming up during the night. Assume
that the birth weights of these four babies can be viewed as a
simple random sample. What is the probability...

For Mexican American infants born in Arizona in 1986 and 1987,
the probability that a child’s gestational age is less than 37
weeks is 0.142 and the probability that his or her birth weight is
less than 2500 grams is 0.051. Furthermore, the probability that
these two events occur simultaneously is 0.031.
1. Let A be the event that an infant gestational age is less
than 37 weeks and B the event that the infant’s birth weight is
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2. Sales at a fast-food restaurant average $6,000 per day. The
restaurant decided to introduce an advertising campaign to increase
daily sales. To determine the effectiveness of the advertising
campaign, a sample of 49 days of sales were taken. They found that
the average daily sales were $6,300 per day. From past history, the
restaurant knew that its population standard deviation is about
$1,000. If the level of significance is 0.05, have sales increased
as a result of the advertising...

ELABORATE EXPLANATIONS PLEASEE
2) Consider babies born in the "normal" range of 37–43 weeks
gestational age. A paper suggests that a normal distribution with
mean μ = 3500 grams and standard deviation σ = 610 grams is a
reasonable model for the probability distribution of the continuous
numerical variable x = birth weight of a randomly selected
full-term baby.
a) What is the probability that the birth weight of a randomly
selected fullterm baby exceeds 4000 g?
b) What is...

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