Question

Question 2: Solve all of the above

Note: Absloute answers with 4 digits ex: 1.1234

A) The mortality rate of COVID-19 can be estimated by taking the ratio of number of coronavirus deaths to the total number of infected people. The mortality rate in KSA is currently estimated at 0.02 according to the available records. How many total records of corona infected people should be analyzed (i.e. how large a sample -n is required) if we want to be 90% confident that the mortality rate estimate is within 0.0017 of the true COVID-19 mortality rate value?

[ ]

B) Find the probability for X>27.48 given that X is Normally Distributed with mean = 20 and standard deviation = 4?

[ ]

C) A statistician is trying to estimate the average number of members per household in a given city. He selected a random neighborhood in the city with 78 households and found that the sample average equals to 4.3 members. Assuming that the standard deviation is known to be 1.43 members from previous years’ published statistics, what is the lower limit of a 95% two sided confidence interval constructed to estimate the mean of number of members per household in the city?

[ ]

D) Find the probability for 0.53

[ ]

Answer 1

A)

B)

c)

Lower limit = 3.9826

D)

Need distribution