The Maldives boasts of inexpensive weddings. From past data, the average cost of a wedding is $7500, with a standard deviation of $975. To test if the true mean costs have changed, a random sample of 36 current weddings is taken. Their average is $7750. Is there evidence that currently , the true mean cost of wedding differs from the usual $7500 ? Perform the test at alpha=0.05 .

If the computed value of the test statistic is 1.96, what is the p -value ?

A 0.005 B 0.01 C 0.025 D 0.05

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.

What is the solution for the following system of equations? use any method to solve. y = -x +4 y = x - 2 a. ( 4 , -2) b. (2, 1) c. (3, 1) d.(3, -2)