Open your favorite music playlist. Collect a sample of songs consisting of the length of the songs (in seconds). In at least 300 words and showing ALL CALCULATIONS, plan and describe the sampling procedure and then use the results to construct a confidence interval estimate of the mean age length of all songs in your playlist. Reply to a classmates's post in at least 100 words.

Astudy was conducted to determine the proportion of people who dream in black and white instead of color. among 306 people over the age of 55, 68 dream in black and white, and among 298 people under 25, 13 dream in black and white ( based on data from do we dream in color) we want to use a 0.01 significance level to test the claim that the proportion of people over 55 who dream in black and white is greater than the proportion of those under 25.