A tennis player usually makes a successful first serve 74% of the time.She buys a new racket hoping that it will improve her success rate.During the first month of playing with her new racket she makes 402 successful first serves out of 500.Is this evidence that with the new racket her success rate has improved? In other words,is this an unusual result for her? Explain.

A) No; we would normally expect her to make 370 first serves with a standard deviation of 19.24.402 is 1.7 standard deviations above the expected value.That's not an unusual result.
B) No; we would normally expect her to make 370 first serves with a standard deviation of 96.20.402 is 0.3 standard deviations above the expected value.That's not an unusual result.
C) No; we would normally expect her to make 370 first serves with a standard deviation of 9.81.402 is 3.3 standard deviations above the expected value.That's not an unusual result.
D) Yes; we would normally expect her to make 370 first serves with a standard deviation of 96.20.402 is 0.3 standard deviations above the expected value.That's an unusual result.
E) Yes; we would normally expect her to make 370 first serves with a standard deviation of 9.81.402 is 3.3 standard deviations above the expected value.That's an unusual result.

Use a vertical format to find the product of the two polynomials. $\left(3x^2-4x-4\right)\left(3x^2-4x-1\right)$

A) $9x^5-24x^3+x^2+20x+4$
B) $9x^4-24x^3+x^2+20x+4$
C) $9x^4-24x^3+20x+4$
D) $9x^4-24x^3+x^2+4$
E) $9x^4-24x^3+x^2+20x$

How long before a future payment of $1,000 would a payment of just $100 be an economically equivalent alternative? Round your answer to the nearest month. Assume money can earn 4.8% compounded semiannually.

One reason for performing a paired-difference experiment is to:

A) reduce the degrees of freedom
B) allow one to use a larger value of
C) reduce the quantity of information in the experiment
D) reduce the variability in the sample data
E) do none of these

Determine whether the sequence is arithmetic. If so, find the common difference. $\frac{1}{5},\frac{3}{5},\frac{9}{5},\frac{27}{5},\frac{81}{5},\dots$

A) $\frac{3}{5}$
B) $\frac{9}{5}$
C) 2
5
D) $\frac{81}{5}$
E) The sequence is not arithmetic.

The sample size needed to estimate a population mean to within 50 units was found to be 97.If the population standard deviation was 250,then the confidence level used was

A) 90%
B) 95%
C) 99%
D) None of these choices.

Use a calculator to evaluate ${\log }_{2}0.46$ by means of the change-of-base formula. Round your answer to four decimal places.

A) -2.5796
B) -1.1203
C) -0.7765
D) -0.4865
E) -0.8926

A bank statement shows a balance of $1,471.84. The check register of the account owner shows outstanding checks of $325.55, $50.30, and $14.46 and an outstanding deposit of $4,320.01. Compute the adjusted cash balance of the bank statement.