Week 2 practice quiz qnt/561 my mathlab (university of phoenix)


QNT/561   My Mathlab (University Of Phoenix) (I am only willing to pay 25 so please do not message me if you want more).


Week 2 Practice Quiz


Questions 1-16


It is a new quiz so I do not need an old one because it will not be the same answers.


Some sample questions that are on the Quiz:


1. A random sample of 88 observations produced a mean x=25.9 and a standard deviation s=2.8.


a. Find a 95% confidence interval for μ.


b. Find a 90% confidence interval for μ.


c. Find a 99% confidence interval for μ.


2. Health care workers who use latex gloves with glove powder on a daily basis are particularly susceptible to developing a latex allergy. Each in a sample of 50 hospital employees who were diagnosed with a latex allergy based on a skin-prick test reported on their exposure to latex gloves. Summary statistics for the number of latex gloves used per week are x=19.7 and s=11.8. Complete parts (a)−(d).


3. Each child in a sample of 63 low-income children was administered a language and communication exam. The sentence complexity scores had a mean of 7.64 and a standard deviation of 8.94. Complete parts a through d.


4. The random sample shown below was selected from a normal distribution. 3, 8, 8, 9, 7, 1 Complete parts a and b. 


5. Periodically, a town water department tests the the drinking water of homeowners for contaminants such as lead. The lead levels in water specimens collected for a sample of 10 residents of the town had a mean of 2.7 mg/L and a standard deviation of 1.8 mg/L. Complete parts a through c.


6. An accounting firm annually monitors a certain mailing service’s performance. One parameter of interest is the percentage of mail delivered on time. In a sample of 311,000 items mailed between Dec. 10 and Mar. 3—the most difficult delivery season due to bad weather and holidays—the accounting firm determined that 280,600 items were delivered on time. Use this information to make a statement about the likelihood of an item being delivered on time by that mailing service.


7. Suppose you’re given a data set that classifies each sample unit into one of four categories: A, B, C, or D. You plan to create a computer database consisting of these data, and you decide to code the data as A=1, B=2, C=3, and D=4. Are the data consisting of the classifications A, B, C, and D qualitiative or quantitative? After the data are input as 1, 2, 3, or 4, are they qualitative or quantitative?


8. In one university, language professors incorporated a 10-week extensive reading program to improve students’ Japanese reading comprehension. The professors collected 269 books originally written for Japanese children and required their students to read at least 40 of them as part of the grade in the course. The books were categorized into reading levels (color-coded for easy selection) according to length and complexity. Complete parts a through c.


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