Question

A 99% confidence interval for the population mean difference
in weight of all kittens (3 month old) and of all cats (2 years
old) is (3,4)

(in pounds).

You may assume the assumptions hold. Interpret this interval
in full context.

Using this interval, would you conclude at the 5% significance
level that, on average, the weight of a cat and a kitten
differ?

(Hint: Would you conclude this at the 1% level? What does that
tell you about the 5% level?)

Answer #1

4. A random sample of 24 direwolves found an average weight of
520 pounds with a standard deviation of 48 pounds. The weights of
all direwolves follow a normal distribution.
(a) Is there evidence at the α = 0.025 significance level to
conclude the mean weight of all direwolves is more than 500
pounds?
(b) Interpret the P-value in the context of this test.
(c) Explain what a Type I error would mean in the context of
this test.
(d)...

To estimate with a 99% confidence interval, the difference in
mean earned income among men and women based on a sample of 30
women and 20 men, would you use for the significance test or
confidence interval the t-student or the Z-score values? Why?

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...

The 95% confidence interval for all the mean
weight of infants born to mothers who smoke is µ = 5.40 to 6.80
pounds. The mean weight for a random sample of 25 newborns in this
region is 7.2 pounds with a standard deviation (s) of 0.85 pounds.
Is the birth weight of the infants in this sample significantly
different from that of the general population at α=0.05? (10
points) Explain your response (4 pts).
Please show work . Thank you...

Suppose you calculate a 95% confidence interval for the
difference in population means. The confidence interval contains
both negative and positive values.
Will a 99% confidence interval based on the same data contain
both negative and positive numbers as well? Choose the correct
response from the options provided below.
Yes. Keeping all other values the same, increasing the
confidence level leads to a wider interval which would still
include negative and positive numbers.
No. Increasing the confidence level leads to...

Suppose you calculate a 95% confidence interval for the
difference in population means. The confidence interval contains
both negative and positive values.
Will a 99% confidence interval based on the same data contain
both negative and positive numbers as well? Choose the correct
response from the options provided below.
A. Yes. Keeping all other values the same, increasing the
confidence level leads to a wider interval which would still
include negative and positive numbers.
B.
No. Increasing the confidence level...

1. The mean weight of all 21-year-old women 132 pounds. A random
sample of 35 vegetarian women who are 21 years old showed a sample
mean of 127 pounds with a standard deviation of 15 pounds. The
women's measurements were independent of each other. Determine
whether the mean weight for 21-year old vegetarian women is
significantly less than 132, using a significance level of 5%

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...

(e)(6) Calculate an approximate 95% confidence interval for the
mean gallons of beer drunk by all Montana adults. Suppose MBA was
now interested if on average Montanan adults drink a different
amount than 40.8 gallons. Is the sample result significant at a
significance level of.05 based on this confidence interval?
(f) (4) Interpret this confidence interval in the context of the
problem. Circle all true statements.
i. There is a 95% probability that the mean gallons of beer
drunk by...

**6) Find a 90% confidence interval for the true mean weight of
all bolts produced by a particular machine in a factory. It is
known from previous experimenting with this particular machine that
the population standard deviation is 0.8**
```{r}
Bolts<-c(2.3, 2.7, 2.4, 2.2, 2, 4, 3, 3.3, 1.1, 2.1, 2, 2.9,
1.9, 3.2, 2.1, 3, 3.4, 1.1)
###Please do your work here###
##############################
```
**How would you interpret this confidence interval? Please type
your answer on the line below**...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 15 minutes ago

asked 19 minutes ago

asked 20 minutes ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago