Question

n | Mean (grams) | STD. Dev(grams) | |

Mapano Island | 24 | 47.5 | 2.97 |

Kinawa Island | 30 | 44.2 | 2.24 |

Find the 95% confidence interval for the difference in mean weights between the lizards from the two islands.

Answer #1

pls upvote...!!!

If n=50, Std Dev from the mean =2, Tail = 1, what is P and how
is it found? What if it is two tailed?
Inversely,
if n = 100, Std Dev from the mean is unknown, tails = 1, and P
=.05, what is Std Dev and how is it found? What if it is two
tailed?

Find the 99% confidence interval for the difference between two
means based on this information about two samples. Assume
independent samples from normal populations. (Use conservative
degrees of freedom.) (Give your answers correct to two decimal
places.)
Sample
Number
Mean
Std. Dev.
1
25
30
32
2
12
25
24
Lower Limit
Upper Limit

Find the 95% confidence interval for the difference between two
means based on this information about two samples. Assume
independent samples from normal populations. (Use conservative
degrees of freedom.) (Give your answers correct to two decimal
places.)
Sample
Number
Mean
Std. Dev.
1
17
40
26
2
30
26
27
Lower Limit
Upper Limit
You may need to use the appropriate table in Appendix B to answer
this question.

Find the 95% confidence interval for the difference between two
means based on this information about two samples. Assume
independent samples from normal populations. (Use conservative
degrees of freedom.) (Give your answers correct to two decimal
places.)
Sample
Number
Mean
Std. Dev.
1
21
34
29
2
25
23
27
Lower Limit
Upper Limit

The mean cholesterol of Americans is 180 with standard deviation
30. In a local town, 32 cholesterol samples are taken as follows. A
company is interested to know if the mean cholesterol in this town
is statistically different than the rest of America.
Mean
171.84375
Std Dev
18.477727
Std Err Mean
3.2664316
Upper 95% Mean
178.50568
Lower 95% Mean
165.18182
N
32
Hypothesized Value
180
Actual Estimate
171.844
DF
31
Std Dev
18.4777
Sigma given
30
z Test
Test Statistic...

You measure 24 turtles' weights, and find they have a mean
weight of 72 ounces. Assume the population standard deviation is
12.7 ounces. Based on this, what is the maximal margin of error
associated with a 95% confidence interval for the true population
mean turtle weight.
Give your answer as a decimal, to two places
±± ounces

Find the 99% confidence interval for the difference between two
means based on this information about two samples. Assume
independent samples from normal populations. (Use conservative
degrees of freedom.) (Give your answers correct to two decimal
places.) Sample Number Mean Std. Dev. 1 11 39 34 2 23 25 22 Lower
Limit Upper Limit

Question 3: Independent-Samples t-Test
Group
Statistics
type of school
N
Mean
Std. Deviation
Std. Error Mean
reading score
public
168
51.8452
10.42279
.80414
private
32
54.2500
9.19677
1.62578
Independent
Samples Test
Levene's Test for
Equality of Variances
t-test for Equality of
Means
F
Sig.
t
df
Sig. (2-tailed)
Mean Difference
Std. Error
Difference
95% Confidence
Interval of the Difference
Lower
Upper
reading score
Equal variances
assumed
.564
.453
-1.217
198
.225
-2.40476
1.97519
-6.29986
1.49034
Equal variances not
assumed
-1.326...

You measure 25 textbooks' weights, and find they have a mean
weight of 30 ounces. Assume the population standard deviation is
5.2 ounces. Based on this, construct a 95% confidence interval for
the true population mean textbook weight.
Give your answers as decimals, to two places
_____ < μ < _____

Using techniques from an earlier section, we can find a
confidence interval for μd. Consider a
random sample of n matched data pairs A,
B. Let d = B − A be a random
variable representing the difference between the values in a
matched data pair. Compute the sample mean
d
of the differences and the sample standard deviation
sd. If d has a normal distribution or
is mound-shaped, or if n ≥ 30, then a confidence
interval for μd...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 12 minutes ago

asked 16 minutes ago

asked 17 minutes ago

asked 21 minutes ago

asked 28 minutes ago

asked 29 minutes ago

asked 41 minutes ago

asked 46 minutes ago

asked 47 minutes ago

asked 49 minutes ago

asked 1 hour ago