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Please Help. I Don’t Know Which Method To Use. Homework. University Level Please?

Please could you show how to work these two questions. I’m not sure if there is some information that was left out in question 5. Thanks in advance. =)
Question 4
A large multibranch bank is affiliated with both MasterCard and Visa Credit cards. A random sample of 50 MasterCard clients founds that their average month end credit card balance was N$944.00; for a random sample of 66 Visa card clients, their average month end credit card balance was found to be N$827.00.
Assume the population of month end credit cards balances for the clients is normally distributed with population standard deviation of N$294.00 for MasterCard and N$ 336.00 for Visa Credit cards respectively. Is there a difference in the variances between the MasterCard and Visa Credit cards clients at 5% level of significance? [12]
Question 5
In a sample 1383 Unam hostel students 979 students were found to favour to study over the weekend to improve their academic performance.
(a) Find a point estimate for the population proportion р of those in favour of studying over the weekend to improve their academic performance and interpret it. [4]
(b) Find the minimum sample size needed to estimate the population proportion at the 99% confidence level in order to ensure that the estimate is accurate within 4% of the population proportion. [5]

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