Question

In: Statistics and Probability

iTunes library of mp3s has a very large number of songs. A student creates a playlist...

iTunes library of mp3s has a very large number of songs. A student creates a playlist of 45 randomly selected songs. The sample mean length of the songs is 241.27 seconds and the standard deviation is 93.40 seconds.

Note: Numbers are randomized in each instance of this question. Pay attention to the numbers in this question.

What is the lower bound for a 95% confidence interval for the actual mean length of the songs? Give your answer to 4 decimal places.

Solutions

Expert Solution

Solution :

sample size = n = 45

Degrees of freedom = df = n - 1 = 44

t ,df = 2.015

Margin of error = E = t,df * (s /n)

= 2.015 * (93.40 / 45)

Margin of error = E = 28.0553

The 95% confidence interval estimate of the population mean is,

- E < < + E

241.27 - 28.0553 < < 241.27 + 28.0553

213.2147 < < 269.3253

Lower bound = 213.2147

orchestra answered 2 years ago
Next > < Previous

Related Solutions

iTunes songs ~ iTunes library of mp3s has a very large number of songs. A student...
iTunes songs ~ iTunes library of mp3s has a very large number of songs. A student creates a playlist of 45 randomly selected songs. The sample mean length of the songs is 240.14 seconds and the standard deviation is 92.34 seconds. Note: Numbers are randomized in each instance of this question. Pay attention to the numbers in this question. What is the lower bound for a 95% confidence interval for the actual mean length of the songs? Give your answer...
15) iTunes songs ~ iTunes library of mp3s has a very large number of songs. A...
15) iTunes songs ~ iTunes library of mp3s has a very large number of songs. A student creates a playlist of 45 randomly selected songs. The sample mean length of the songs is 240.52 seconds and the standard deviation is 94.47 seconds. What is the upper bound for a 95% confidence interval for the actual mean length of the songs? Give your answer to 4 decimal places. Your Answer:
A hungry, but very inquisitive student was taking a break from studying in the library. She...
A hungry, but very inquisitive student was taking a break from studying in the library. She went to the vending machine and bought a bag of Skittles. After returning to her table, she dumped them out on the table and noticed that her bag contained 25 red, 13 green, 17 yellow, 12 purple, and 24 orange candies. It seemed like an excess of red and orange and not enough purple or green. Do a χ2 test to determine whether this...
A hungry, but very inquisitive student was taking a break from studying in the library. She...
A hungry, but very inquisitive student was taking a break from studying in the library. She went to the vending machine and bought a bag of Skittles. After returning to her table, she dumped them out on the table and noticed that her bag contained 25 red, 13 green, 17 yellow, 12 purple, and 24 orange candies. It seemed like an excess of red and orange and not enough purple or green. Do a χ2 test to determine whether this...
Historically, the structure of retailing in India was very fragmented with a large number of very...
Historically, the structure of retailing in India was very fragmented with a large number of very small stores serving most of the market. Supply chains were also very poorly developed and fragmented. As recently as 2010, larger format big box stores, chain stores, and supermarkets only accounted for 4 percent of retail sales in the country (compared to 85 percent in the United States). This might sound like an ideal opportunity for efficient foreign retailers such as Walmart, IKEA, Tesco,...
Historically, the structure of retailing in India was very fragmented with a large number of very...
Historically, the structure of retailing in India was very fragmented with a large number of very small stores serving most of the market. Supply chains were also very poorly developed and fragmented. As recently as 2010, larger format big box stores, chain stores, and supermarkets only accounted for 4 percent of retail sales in the country (compared to 85 percent in the United States). This might sound like an ideal opportunity for efficient foreign retailers such as Walmart, IKEA, Tesco,...
Historically, the structure of retailing in India was very fragmented with a large number of very...
Historically, the structure of retailing in India was very fragmented with a large number of very small stores serving most of the market. Supply chains were also very poorly developed and fragmented. As recently as 2010, larger format big box stores, chain stores, and supermarkets only accounted for 4 percent of retail sales in the country (compared to 85 percent in the United States). This might sound like an ideal opportunity for efficient foreign retailers such as Walmart, IKEA, Tesco,...
Historically, the structure of retailing in India was very fragmented with a large number of very...
Historically, the structure of retailing in India was very fragmented with a large number of very small stores serving most of the market. Supply chains were also very poorly developed and fragmented. As recently as 2010, larger format big box stores, chain stores, and supermarkets only accounted for 4 percent of retail sales in the country (compared to 85 percent in the United States). This might sound like an ideal opportunity for efficient foreign retailers such as Walmart, IKEA, Tesco,...
C++: Write a student class for the library, which have the following: Username, password, Maximum number...
C++: Write a student class for the library, which have the following: Username, password, Maximum number of copies that a student is allowed to keep(less than 5), maximum borrow periods(less than 30 days per book), list of copy(array) cpp and h
Create a class named Student. Student has fields for an ID number, number of credit hours...
Create a class named Student. Student has fields for an ID number, number of credit hours earned, and number of points earned. (For example, many schools compute grade point averages based on a scale of 4, so a three-credit-hour class in which a student earns an A is worth 12 points.) Include methods to assign values to all fields. Student also has a field for grade point average. Include a method to compute the grade point average field by dividing...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT