Author: Anonymous

In the past, Disneyland believed that 34% of visitors buy a churro.  To see if that has changed, Disneyland plans to choose a random sample of 300 visitors. 1. Assuming that the 34% is correct, what is the mean and standard deviation in the number of visitors in groups of 300 that would be expected to buy a churro?  Where rounding is necessary, round to one decimal places. Mean = [mean] visitors          Standard deviation = [sd] visitors 2. Describe the sampling distribution of the sample proportion for samples of size n = 300. The sampling distribution is [norm] with a mean 

The histogram above givens information on the measured heights of black cherry trees.  Use the graph to answer the following questions.  1. What was the variable in the study?  [var] 2. Is the variable qualitative or quantitative? [qual] 3. What is the class width in this graph? [num] 4. What percentage of the trees were at least 70 feet tall?  [80]

The histogram above givens information on the measured heights of black cherry trees.  Use the graph to answer the following questions.  1. What was the variable in the study?  [var] 2. Is the variable qualitative or quantitative? [qual] 3. How many trees were measured? [num] 4. What percentage of the trees were at least 80 feet tall?  [80]  

The probability that a person owns a red car is [x].  What is the probability that a person does not own a red car? Enter your response rounded to three decimal places in the format 0.XXX.  If you do not use the correct format your response will be considered incorrect. 

The graph below gives the responses when a sample of people were asked what is the nicest fruit.  How many people responded to this survey?

A random sample of 2301 people living in Los Angeles indicated that 75 agreed with the statement, “I would like to change jobs within the next year.” Complete the following based on this information using only definitions provided in this class.  It is [un] for a person living in Los Angeles to agree with the statement because the probability of [prob] is [less].

Salaries for nurses in Florida are normally distributed with a mean of $72,000 and a standard deviation of $4211. 1. If one nurse in Florida is chosen, what is the probability that the salary of this nurse is greater than $74,500? Round your response to 4 decimal places. [q1] 2. 92% of nurses in Florida earn between [lower] and [upper].  Round to the nearest dollar.  Suppose a random sample of 45 nurses in Florida is chosen.  3. Describe the sampling distribution of the mean for samples of size n = 45.  Be sure to address the shape, the mean of the sampling distribution and the standard error of the mean.  Where rounding is necessary, round to the nearest dollar.  The sampling distribution of the mean is [shape] with a mean of [mean]  and standard error of [se].   4. What is the probability that a random sample of 45 nurses in Florida have a mean salary of greater than $73,000? a. The probability is [prob].  (Round to 4 decimal places) b. if [100s] were chosen from this population, we’d expect about [number] to have a mean price of more than $73,000. 

Find the area under the standard normal curve to the left of z = 2.06. 

Determine whether or not the following represents a binomial experiment.   At a certain college about 10% of the students are math majors.  In one dorm with 30 students 5 are selected without replacement and the number of math majors in the 5 recorded. 

The author surveyed some of the students in one of his statistics classes about the numbers of hours they work per week. Their responses are described by the histogram below.  Use the graph to answer the following questions. 1. What is the variable in this graph?  [answer1] 2. Is the variable qualitative or quantitative? [answer2] 3. What is the sample size represented in the graph?  [answer3] 4. What percentage of respondents said less than 15 hours?  [answer4]