More information from the online dating survey a survey conducted in july 2015 asked a random sample of american adults whether they had ever used online dating (either an online dating site or a dating app on their cell phone). 55- to 64-year-olds the survey included 411 adults between the ages of 55 and 64, and 50 of them said that they had used online dating. if we use this sample to estimate the proportion of all american adults ages 55 to 64 to use online dating, the standard error is 0.016. find a 95% confidence interval for the proportion of all us adults ages 55 to 64 to use online dating.

(20 points) a bank has been receiving complaints from real estate agents that their customers have been waiting too long for mortgage confirmations. the bank prides itself on its mortgage application process and decides to investigate the claims. the bank manager takes a random sample of 20 customers whose mortgage applications have been processed in the last 6 months and finds the following wait times (in days): 5, 7, 22, 4, 12, 9, 9, 14, 3, 6, 5, 15, 10, 17, 12, 10, 9, 4, 10, 13 assume that the random variable x measures the number of days a customer waits for mortgage processing at this bank, and assume that x is normally distributed. 2a. find the sample mean of this data (x ě…). 2b. find the sample variance of x. find the variance of x ě…. for (c), (d), and (e), use the appropriate t-distribution 2c. find the 90% confidence interval for the population mean (îľ). 2d. test the hypothesis that îľ is equal to 7 at the 95% confidence level. (should you do a one-tailed or two-tailed test here? ) 2e. what is the approximate p-value of this hypothesis?

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be

Astudent was asked to find the square of 7x+3. the student quickly wrote (7x+3)^3= 49x^2+9. identify the student's error and provide the correct answer.