# Stats Library

## Statistics Assignment Library

1. ##### Solved (Free): It is known that the duration of consultation with patients in a psychiatry clinic is normally distributed with an average of 35 minutes
It is known that the duration of consultation with patients in a psychiatry clinic is normally distributed with an average of 35 minutes and a standard deviation of 5 minutes. One of the doctors working in this clinic claimed that...
2. ##### Solved (Free): Oxygen levels are measured to control breathing in symptoms of a disease. In the measurements taken from 242 people, it was observed that the oxygen values were normally distributed
Oxygen levels are measured to control breathing in symptoms of a disease. In the measurements taken from 242 people, it was observed that the oxygen values were normally distributed with an average of 33.3 and a standard deviation of 12.14....
3. ##### Solved (Free): For a request to use the campus computing cluster, and knowing that your jobs’ durations are normally distributed with a mean of one hour and a standard
For a request to use the campus computing cluster, and knowing that your jobs' durations are normally distributed with a mean of one hour and a standard deviation of 10 minutes, answer the following inquiries. (a) What is the probability...
4. ##### Solved (Free): In a study conducted for the effectiveness of drug A on a certain disease, 60 randomly selected patients with this disease were given medication
In a study conducted for the effectiveness of drug A on a certain disease, 60 randomly selected patients with this disease were given medication and 36 patients recovered. Calculate the confidence interval for the efficacy of this drug for a...
5. ##### Solved (Free): Students in a high school can choose to study Spanish or French as a foreign language
Students in a high school can choose to study Spanish or French as a foreign language. In a given academic year, 90% of the pupils choose Spanish and the rest choose French. 30% of the students who are learning Spanish...
7. ##### Solved (Free): The average salary of a male full professor at a public four-year institution offering classes at the doctoral level is
The average salary of a male full professor at a public four-year institution offering classes at the doctoral level is \$109628. For a female full professor at the same kind of institution, the salary is \$79330. If the standard deviation...
8. ##### Solved (Free): A data set has a mean of 1,200 and a standard deviation of 80 Using Chebyshev’s theorem, what percentage of
A data set has a mean of 1,200 and a standard deviation of 80. a. Using Chebyshev's theorem, what percentage of the observations fall between 880 and 1,520? (Do not round intermediate calculations. Round your answer to the nearest whole...
9. ##### Solved (Free): The lengths of 3 inch nails manufactured on a machine are normally distributed with a mean of 3 and a standard deviation of
The lengths of 3 inch nails manufactured on a machine are normally distributed with a mean of 3 and a standard deviation of .009. The nails are either shorter than 2.98 inches or longer than 3.02 inches are unusable. what...
10. ##### Solved (Free): In a study, physicians were asked what the odds of breast cancer would be in a woman who was initially thought to have
In a study, physicians were asked what the odds of breast cancer would be in a woman who was initially thought to have a 1% risk of cancer but who ended up with a positive mammogram result (a mammogram accurately...