Practice test 2 questions and answers

Practice test 2 questions and answers In a NiCd battery, a fully charged cell is composed of nickelic hydroxide. Nickel is an element that has multiple oxidation states. Assume the following proportions of the states: X: 0, 2, 3, 4 p(X): p, 0.23, 0.35, 0.20 The missing probability p is equal to _____? 0.22 Which of the following is NOT a characteristic of a binomial distribution? The probability of success converges to 0.50. The probability distribution of a discrete random variable x is shown in the following table: x: 1, 2, 3, 4, 5 P(x) 0.22, 0.22, 0.37, 0.05, 0.14 Find P(x≥3) 0.56 The dean of a college wants to know about the type of professors in the Mathematics and Statistics department. She asks each professor if they would classify themselves as primarily interested in mathematics or primarily interested in statistics, and she asks what the highest level of education they completed is. The results are shown in the table below. How many professors are primarily interested in math or have achieved a master's as their highest level of education? 19 Which of the following random variables is discrete? the number of heads tossed on four distinct coins What is the range of probabilities for an event A? 0≤P(A)≤1 A sample space is _______________________. the set of all possible outcomes in an experiment. The following two-way contingency table gives the breakdown of the population in a particular locale according to party affiliation (A, B, C, or None) and opinion on a bond issue: Affiliation Opinion Favors Opposes UndecidedA0.120.090.07B0.160.120.14C0.040.030.06None0.080.060.03 A person is selected at random. The probability that the person has no party affiliation AND is undecided is ? 0.03 number of students in class discrete distance traveled between classes continuous weight of students in class continuous number of red marbles in a jar discrete time it takes to get to school continuous number of heads when flipping a coin three times discrete discrete The z-score that cuts off a right tail of 10% is: z0.10 Find the cumulative area that corresponds to a z-score of 0.24 =NORM.DIST(0.24, 0, 1, TRUE) Which of the following are NOT properties of the normal distribution? centered at 0 with standard deviation of 1. An economist samples 20 Fortune 500 companies and finds they have an average CEO salary of $11.5 million with a standard deviation of $2 million. She wants to know what t-value corresponds to a probability of 0.75. Which function finds this in Excel? =T.INV(0.75, 19) A randomly selected sample of size 19 has a mean of 3 and a standard deviation of 1. Assume the population is normally distributed. Which function finds the probability that t is greater than 1.3? =1 - T.DIST(1.3, 18, TRUE)