Answers edited by BeeFree

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• 1545 subjects were given ginko & 1524 placebo. In ginko group, 246 developed dementian & in the placebo it was 277 with dementia. Significance level=0.01 to test claim(ginko is effective in dementia) Can you test claim and construct confidence interval?
  
• What does a z-score indicate?
  
• How do you solve the triangle if it has legs with lengths of 18 and 28 and there is a 90 degree angle, X and Y are the other two angles?
  
• Question #a72dd
  
• If the equation of a conic section is #(x-3)^2/49+(y-4)^2/13=1#, how has its center been translated?
  
• What is the formula for instantaneous velocity?
  
• Question #05ff8
  
• What hypothesis test do you use when the population variance is unknown?
  
• What is the difference between continuous and discrete data?
  
• How do you convert 202.5 degrees to radians?
  
• What are the critical values of #f(x)=4x^2+2x+1#?
  
• If you roll a die #100# times and get #15# ones, what is the probability that the die is not fair? What about if you get #5# ones?
  
• Question #f9702
  
• Question #54481
  
• How do you solve #2^(2x) + 2^(x + 2) - 12 = 0#?
  
• How to simplify #(3.3 times 10^4)(3times10^18)# in scientific notation?
  
• On a ship sailing north, a woman notices that a hotel on a shore has a bearing of 20. A little while later, after having sailed 40km, she observes that the bearing of the hotel is now 100. How far is the ship from the hotel?
  
• What is the formula for finding the length of an arc, using radians and degrees?
  
• How do you find the end behavior of #f(x)= 4x - x^(2)#?
  
• How do you use the method of cylindrical shells to find the volume generated by rotating the region bounded by #y=e^(−x^2)#, y=0, x=0, and x=1 about the y axis?
  
• Where should I draw the asymptotes of #(x+2)^2/4-(y+1)^2/16=1#?
  
• In a Unit Circle what do the radian values mean?
  
• How do you find the vertex and axis of symmetry, and then graph the parabola given by: #f(x)=2x^2-6x-5#?
  
• What are the extrema of #f(x)=-sinx-cosx# on the interval #[0,2pi]#?
  
• Question #e85fa
  
• Question #0f302
  
• What z score corresponds to a one sided p-value of 93%?
  
• Question #26b22
  
• How do you graph #4x^2 + 4y^2 + 24x - 32y + 51#?
  
• What is the expected value of a lottery ticket which pays $10 million if the ticket contains the six winning numbers chosen from the set {1,2,3,...,50}?
  
• How do you simplify #i^42#?
  
• Question #60d5b
  
• What is the difference between a normal and binomial distribution?
  
• If you regress random variable Y against random variable X, would the results be the same if you regressed X against Y?
  
• The angle of elevation is 19°20' from a ship at sea to the top of a 159 ft lighthouse. How do you find, to three significant digits, the distance of the ship from the base of the lighthouse?
  
• How do you solve #sqrt(x-5) - sqrt(2x-3) = -2#?
  
• Why can the median of a data set differ from the mean?
  
• Is it possible for 75% of the data to be above the median?
  
• What is the difference between the R-Squared and adjusted R-Squared when running a regression analysis?
  
• Question #8fed0
  
• How do you find the sum of the infinite geometric series 8 - 10 + 12.5 - 15.625 + ...?
  
• How do you solve #ln(x)=x-2#?
  
• Question #36631
  
• What quadrant would (2, 6) be?
  
• How do you find the volume of the region enclosed by the curves #y=x#, #y=-x#, and #x=1# rotated about the y axis?
  
• What is the z-score of a 97.5% one sided p-value?
  
• How do you determine whether a linear system has one solution, many solutions, or no solution when given 7x+4y=26 and 3x-8y=-18?
  
• What z-score corresponds to a one sided p-value of 10%?
  
• How do you use synthetic division to find: f(-2): #f(x) = 3x^4 - 2x^2 + 1#?
  
• Question #0b699
  
• How does a linear regression differ from a multiple linear regression?
  
• How do you use partial fraction decomposition to decompose the fraction to integrate #(2x+1)/((x+1)^2(x^2+4)^2)#?
  
• Question #23b0f
  
• How do you find the formula of an exponential graph given (0, -2) and (2, -50)?
  
• Question #6f7ed
  
• Men ages(20-29) have meanheight 69.3 with s.dev of 2.5 in. An analyst wonders if sd of majorleague players less than 2.5 in. Heights of 20 random players are:72, 74, 71, 72,76,70,77,75,72,72,77,73,75,70,73,74,75,73,74,73. Can you help me find the P value?
  
• How do you find the general solutions for #cos (x)^4-sin (x)^4=2*cos (x)*cos(2x)#?
  
• If X and Y are uncorrelated variables, what is Var(X+Y) in terms of Var(X) and Var(Y)?
  
• How do you find the vertex and axis of symmetry, and then graph the parabola given by: # f(x)=(x+2)^2-8#?
  
• How do you find the critical points for # f(x)=x^3-6x^2+12x-6#?
  
• What is the mathematical difference between the probability density functions of a normal distribution and a standard normal distribution?
  
• How do you use the shell method to set up and evaluate the integral that gives the volume of the solid generated by revolving the plane region #y=2-x#, #2<=x<=4# rotated about the x-axis?
  
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