Question

The following data for a random sample of banks in two cities represent the ATM fees for using another bank's ATM. Compute the sample variance for ATM fees for each city.

City A 2.50 1.00 1.25 0.00 1.75

City B 1.00 1.00 1.50 1.25 1.00

Variance for City A:

Variance for City B:

Answer #1

The following data represent the flight time (in minutes) of a
random sample of seven flights from one city to another city.
286
269
259
265
256
263
257
Compute the range and sample standard deviation of
flight time.
The range of flight time is __?__minutes.
The sample standard deviation of flight time is
__?__minutes.
(Type an integer or decimal rounded to one decimal place as
needed.)

The following data represent the amount of time (in minutes) a
random sample of eight students took to complete the online potion
of an exam in a particular statistics course. Compute the mean,
median, and mode time.
60.2, 71.7, 83.9, 105.2, 128.4, 99.6, 94.7, 121.5
Compute the mean exam time. Select the correct choice below and,
if necessary, fill in the answer line to complete your
choice.
A. The mean exam time is ________________
(Round to two decimal places...

The following data represent the math SAT scores for a random
sample of seniors from three different high schools.
School A
School B
School C
488
445
618
592
370
525
537
382
651
470
423
647
539
523
543
Using α=0.05, perform a hypothesis test to determine if the math
median SAT score differs among these three high schools.

You compare monthly car insurance rates for two sister cities.
You collect data and come up with the following:
You decided to test whether the monthly car insurance rates are
different between the sister cities. Assume that both underlying
population distributions are normal.
a) Should you use the pooled or non-pooled t - test? Explain.
City A
City B
Sample Mean
$105
$125
Sample Standard Deviation
$20
$9
Sample Size
14
12
b) Test at the 5% level of significance...

The following data represent the battery life, in hours, for a
random sample of 5 full charges on a fifth
generation iPod music player. The data are normally
distributed.
7.3 10.2 12.9 10.8 12.1
(a) Construct a 90% confidence interval for the mean number of
hours that the battery will last on
this player.
(b) Construct a 90% confidence interval for the population standard
deviation of the battery life.

The following data represent the pH of rain for a random sample
of
12
rain dates in a particular region. A normal probability plot
suggests the data could come from a population that is normally
distributed. A boxplot indicates there are no outliers. The sample
standard deviation is
s=0.332
Construct and interpret a
90%
confidence interval for the standard deviation pH of rainwater
in this region.
4.634.63
5.195.19
4.934.93
4.894.89
4.714.71
4.754.75
5.705.70
4.854.85
5.125.12
4.654.65
4.664.66
4.46
Select the...

The following data represent a simple random sample of n = 4
from three populations that are known to be normally distributed.
Verify that the F-test statistic is 2.04.
Sample 1
Sample 2
Sample 3
28
22
25
23
25
24
30
17
19
27
23
30

The following data represent the repair cost for a low-impact
collision in a simple random sample of mini- and micro-vehicles.
Construction a 95% confidence interval for the mean repair cost of
a low-impact collision involving mini- and micro-vehicles using
the Bootstrap t-Method and 200 resamples. 3051 1784 1117 3340 728
2125 648 2624 752 1429.
The lower bound of the bootstrap interval is ______ and the
upper bound is ______

The following data represent the repair cost for a low-impact
collision in a simple random sample of mini- and micro-vehicles.
Construction a 95% confidence interval for the mean repair cost of
a low-impact collision involving mini- and micro-vehicles using
the Bootstrap t-Method and 200 resamples.
3135, 1741, 1047, 3362, 761, 2078, 662, 2589, 791, 1412
The lower bound of the bootstrap interval is ____ and the upper
bound is ____.

The following data represent the pH of rain for a random sample
of 12 rain dates. A normal probability plot suggests the data could
come from a population that is normally distributed. A boxplot
indicates there are no outliers. Complete parts a) through d)
below.
5.58
5.72
4.89
4.80
5.02
4.59
4.74
5.19
5.34
4.76
4.56
5.71
a. what is the point estimate
b construct a 99% interval
c. construct a 95% interval
d. construct a 90% interval

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