Question

Doctors nationally believe that 72% of a certain type
of operation are successful. In a certain

hospital, 53 of these operations were observed, and 63% of them
were successful. Is this hospital's

success rate different from the national average?

a. State the null and alternative hypotheses

b. What is the test statistic?

c. Using a .01 significance level, what is the decision rule?

d. Show the test statistic and essential calculations.

e. What do you conclude? State you findings in a sentence.

Answer #1

Patients recovering from an appendix operation normally spend an
average of 6.3 days in the hospital. The distribution of recovery
times is normal with a ? = 2.2 days. The hospital is trying a new
recovery program designed to lessen the time patients spend in the
hospital. The first 25 appendix patients in this new program were
released from the hospital in an average of 5.5 days. On the basis
of these data, can the hospital conclude that the new...

To obtain information on the corrosion-resistance properties of
a certain type of steel conduit, 45 specimens are buried in soil
for a 2-year period. The maximum penetration (in mils) for each
specimen is then measured, yielding a sample average penetration of
x = 53.4 and a sample standard deviation of s =
4.9. The conduits were manufactured with the specification that
true average penetration be at most 50 mils. They will be used
unless it can be demonstrated conclusively that...

A researcher wishes to investigate the corrosion-resistance
properties of a certain type of steel conduit. He buries 45
specimens in the soil for a 2-year period. The maximum penetration
(in mils) for each specimen is then measured, yielding a sample
average penetration of x = 53.2 and a sample standard
deviation of s = 4.2. The conduits were manufactured with
the specification that true average penetration be at most 50 mils.
They will be used unless it can be demonstrated...

To obtain information on the corrosion-resistance properties of
a certain type of steel conduit, 45 specimens are buried in soil
for a 2-year period. The maximum penetration (in mils) for each
specimen is then measured, yielding a sample average penetration of
x = 52.3 and a sample standard deviation of s =
4.2. The conduits were manufactured with the specification that
true average penetration be at most 50 mils. They will be used
unless it can be demonstrated conclusively that...

To obtain information on the corrosion-resistance properties of
a certain type of steel conduit, 45 specimens are buried in soil
for a 2-year period. The maximum penetration (in mils) for each
specimen is then measured, yielding a sample average penetration of
x = 53.2 and a sample standard deviation of s =
4.2. The conduits were manufactured with the specification that
true average penetration be at most 50 mils. They will be used
unless it can be demonstrated conclusively that...

The authors of a paper studied a random sample of 353 Twitter
users. For each Twitter user in the sample, the tweets sent during
a particular time period were analyzed and the Twitter user was
classified into one of the following categories based on the type
of messages they usually sent.
Category
Description
IS
Information sharing
OC
Opinions and complaints
RT
Random thoughts
ME
Me
now (what I am doing now)
O
Other
The accompanying table gives the observed counts...

Question 5: Assume that you make candy bars; the advertised
weight of the candy bar is 4.0 ounces with a standard deviation
(sigma) of 2.35 oz. however your production manager thinks that
this is not true; he thinks the candy bars are over-weight, they
weigh more than 4.0 oz. To test his claim, you
decided to randomly select a sample of 126 candy bars, the average
weight (x-bar) is 4.5 oz. At an alpha (a) of 0.01 what do you...

The U.S. Department of Transportation, National Highway Traffic
Safety Administration, reported that 77% of all fatally injured
automobile drivers were intoxicated. A random sample of 53 records
of automobile driver fatalities in a certain county showed that 33
involved an intoxicated driver. Do these data indicate that the
population proportion of driver fatalities related to alcohol is
less than 77% in Kit Carson County? Use α = 0.01.
(a) What is the level of significance?
State the null and alternate...

The U.S. Department of Transportation, National Highway Traffic
Safety Administration, reported that 77% of all fatally injured
automobile drivers were intoxicated. A random sample of 53 records
of automobile driver fatalities in a certain county showed that 35
involved an intoxicated driver. Do these data indicate that the
population proportion of driver fatalities related to alcohol is
less than 77% in Kit Carson County? Use α = 0.05.
a) What is the level of significance?
State the null and alternate...

Team 5 answer the questions
What are 4 key things you learned about the topic from reading
their paper?
How does the topic relate to you and your current or past
job?
Critique the paper in terms of the organization and quality.
Incentive Systems
In
this paper, we will focus primarily on financial rewards that
companies use to attract, retain and motivate the brightest and
most talented candidates in the labor market. By providing a reward
system that...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 15 minutes ago

asked 17 minutes ago

asked 23 minutes ago

asked 30 minutes ago

asked 30 minutes ago

asked 40 minutes ago

asked 41 minutes ago

asked 42 minutes ago

asked 48 minutes ago

asked 48 minutes ago

asked 48 minutes ago

asked 51 minutes ago