Listed below are the numbers on the jerseys of the starting lineup for the New Orleans Saints when they won their first Super Bowl football game. Does it make sense to compute the range and standard deviation for these data?
9 23 25 88 12 19 74 77 76 73 78
Range and Standard Deviation. Exercises each provide a set of numbers. In each case, find the range and standard deviation.
In: Statistics and Probability
In studies for a medication, 9 percent of patients gained weight as a side effect. Suppose 664 patients are randomly selected. Use the normal approximation to the binomial to approximate the probability that
(a) exactly 60 patients will gain weight as a side effect.
(b) no more than 60 patients will gain weight as a side effect.
(c) at least 74 patients will gain weight as a side effect. What does this result suggest?
In: Statistics and Probability
A professor at a local community college noted that the grades of his students were normally distributed with a mean of 74 and a standard deviation of 10. The professor has informed us that 6.4 percent of his students received A's while only 2.5 percent of his students failed the course and received F's. What is the minimum score needed to earn an A? Enter your answer rounded to one decimal place.
In: Statistics and Probability
1. What is the two’s complement of: 00110101
2. Carry out the following calculation using 8-bit signed arithmetic (convert to 8-bit binary sequences) and use two’s complement for the negative number, give the result as both an 8-bit binary sequence and in base 10: 127 – 74.
3. What does shifting a binary sequence to left by 3 places correspond to (from the arithmetic standpoint)
In: Computer Science
Number Analysis Program Python:
Initialize an array with these specific 20 numbers: 26 45 56 12 78 74 39 22 5 90 87 32 28 11 93 62 79 53 22 51
Display the following data:
1. The lowest number in the list
2. The highest number in the list
3. The total of the numbers in the list
4. The average of the numbers in the list
In: Computer Science
QUESTION 12
A teacher would like to estimate the mean grade for her class of 50 students on the most recent exam. After the first 10 tests are graded (in random order), her sample results are as follows:
45 60 74 75 79 80 85 86 90 96
Which of the numbers below represent the point estimate?
| A. |
15.4 |
|
| B. |
77.0 |
|
| C. |
84.0 |
|
| D. |
79.5 |
In: Math
LITTLE’S LAW: Diant grocery stores wish to estimate time customers spend, on average, in store and in a checkout line. The results of the data collected are as below:
Avg. rate of customers entering store = 300 cust/hr
Avg. # of customers in store = 150 cust
% of customers who do not make a purchase = 5%
Avg. # customers in checkout lanes = 28.5 cust
a) How much time does the average customer spend in the store?
b) How much total time is spent, on average, to check out? Hint: This is the time that is spent in the checkout lane.
In: Operations Management
An investigation of past consumer surveys done by a company reveals that 2/3 of customers contacted respond to the survey. The marketing manager wants to do a new survey and plans to contact 198 customers.
(a) How many responses should the manager expect to receive?
(b) Give an approximation of the probability that 140 or more customers will respond.
(c) Give an approximation of the probability that 135 to 150 customers will respond.
(d) Give an approximation of the probability that 130 or less customers will respond.
(e) Compare your approximate answers with the exact probability values obtained on Excel.
In: Math
You collect the following data on the average speed (in miles per hour) of a student driver on the highway:
| Speed |
| 68 |
| 66 |
| 69 |
| 82 |
| 83 |
| 82 |
| 75 |
| 79 |
| 86 |
| 79 |
| 80 |
| 79 |
| 77 |
| 59 |
| 73 |
| 72 |
| 71 |
| 51 |
| 73 |
| 100 |
| 73 |
| 80 |
| 80 |
| 67 |
| 72 |
| 70 |
| 67 |
| 68 |
| 75 |
| 66 |
| 63 |
| 87 |
| 72 |
| 62 |
| 69 |
| 58 |
| 74 |
| 78 |
| 73 |
| 67 |
| 73 |
| 79 |
| 84 |
| 75 |
| 65 |
| 65 |
| 68 |
| 78 |
| 64 |
| 60 |
| 85 |
| 77 |
| 82 |
| 86 |
| 74 |
| 87 |
| 100 |
| 77 |
| 71 |
| 75 |
| 72 |
| 72 |
| 76 |
| 58 |
| 76 |
| 63 |
| 76 |
| 72 |
| 66 |
| 73 |
| 79 |
| 83 |
| 84 |
| 86 |
| 78 |
| 78 |
| 77 |
| 64 |
| 65 |
| 78 |
| 68 |
| 81 |
| 92 |
| 86 |
| 56 |
| 84 |
| 83 |
a.If you want to construct a 95% confidence interval, what would use for the t-critical value?
b. what would be the lower boundof your 95% confidence interval?
c. what would be the upper bound of your 95% confidence interval?
In: Economics
A test of abstract reasoning is given to a sample of students before and after they completed a formal logic course. Assume that two dependent samples have been randomly selected from normally distributed populations. The results are given below. At the 0.05 significance level, use critical value method to test the claim that the mean score is not affected by the course. Does the course improve the students’ skill on abstract reasoning?
Before 74 83 75 88 84 63 93 84 91 77
After 73 77 70 77 74 67 95 83 84 75
In: Statistics and Probability