Question

We take a sample of the weights of 350 pieces of candy, and we find an average weight of 3 ounces. We know that the population standard deviation of candy is 10 ounces. What is the 90% confidence interval?

Group of answer choices

(1.77, 4.23)

(2.95, 3.05)

(2.5, 3.5)

(2.12, 3.88)

Answer #1

One-Sample Z test Confidence Interval |

We need to construct the 90% confidence interval for the
population mean μ. We have been provided with the following
information: |

Suppose we are interested in analyzing the weights of NFL
players. We know that on average, NFL players weigh 247 pounds with
a population standard deviation of 47 pounds. Suppose we take a
sample of 30 new players and we find that the average weight from
that sample is 237 pounds. We are interested in seeing if the
weight of NFL players is decreasing
What is the standard error?
What is the margin of error at 90% confidence?
Using my...

You measure 44 backpacks' weights, and find they have a mean
weight of 33 ounces. Assume the population standard deviation is
2.5 ounces. Based on this, what is the maximal margin of error
associated with a 99% confidence interval for the true population
mean backpack weight.
As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval
--Use z = 2 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval....

1) You measure 25 textbook' weights, and find they have a mean
weight of 60 ounces. Assume the population standard deviation is
9.2 ounces. Based on this, what is the maximal margin of error
associated with a 90% confidence interval for the true population
mean backpack weight.
Give your answer as a decimal, to two places
a) You measure 46 textbooks' weights, and find they have a mean
weight of 48 ounces. Assume the population standard deviation is
7.8 ounces....

You measure 31 textbooks' weights, and find they have a mean
weight of 52 ounces. Assume the population standard deviation is
3.5 ounces. Based on this, construct a 99% confidence interval for
the true population mean textbook weight. Give your answers as
decimals, to two places [,]

You measure 22 dogs' weights, and find they have a mean weight
of 42 ounces. Assume the population standard deviation is 2.2
ounces. Based on this, construct a 90% confidence interval for the
true population mean dog weight.

you measure 25 turtles weights, and find they have a mean weight
of 45 ounces. assume the population standard deviation is 4.2
ounces. Based on this, construct a 90% confidence interval for the
true population mean turtle weight.

1. We take a sample of 500 movies from a certain studio to find
the average run time. We know the population standard deviation of
movie run times is 20 minutes. What is the margin of error at 99%
confidence?
Group of answer choices
.89
1.63
2.31
.10

Suppose we are interested in analyzing the weights of NFL
players. We know that on average, NFL players weigh 247 pounds with
a population standard deviation of 47 pounds. Suppose we take a
sample of 30 new players and we find that the average weight from
that sample is 237 pounds. We are interested in seeing if the
weight of NFL players is decreasing
If I wanted to control my margin of error and set it to 5 at
90%...

You measure 47 textbooks' weights, and find they have a mean
weight of 74 ounces. Assume the population standard deviation is
10.3 ounces. Based on this, construct a 90% confidence interval for
the true population mean textbook weight.
Give your answers as decimals, to two places
I am 90% confident that the mean weight of textbooks is
between and ounces.

You measure 26 turtles' weights, and find they have a mean
weight of 39 ounces. Assume the population standard deviation is
12.8 ounces. Based on this, construct a 90% confidence interval for
the true population mean turtle weight.
Give your answers as decimals, to two places
±± ounces

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