1.- You are studying the effects of sleeping late on forgetfulness. What would be stated by the null hypothesis in this study?
A) Sleeping late has an effect on forgetfulness.
B) Sleeping late does not have an effect on forgetfulness.
C).
1. Which of the following summary measures cannot be easily approximated from a box-and-whisker plot?
a) the range b) the interquartile range c) the second quartile d) the standard deviation
2.Determine whether the following type of data is norminal level, ordinal level, interval level.
1. While on vacation you see that the local race track is offering a promotion to the first 100 people arriving for that days races. You have never been to the horse races, but decide to give it a try. You are in line for food and overhear a couple.
1. Why do financiers need hypothesis testing?
Data sets do not cover every instance of an event or measurement.
So they can predict within a degree of certainty where stock prices will go in the future.
Stock and bond pricing data.
1. You are interested in whether husbands or wives care more about how clean their cars are. You collect a random sample of 100 married couples and collect ratings from each partner, indicating the importance each places on car cleanliness. You want to know if the husbands’ ratings tend to.
1. Which of the following is an assumption for computing any type of independent sample t test?
a. Data in the population being sampled are normally distributed.
b. Data were obtained from a sample that was selected using a random sampling procedure.
.
1. Why do Normal Distributions have the mean, median, and mode so close to one another? Why can't they be more spread out?
2. Besides the proximity of the mean, median, and mode, what are some other measures that tell us how normal a distribution is? Explain.
1. You want to estimate the mean amount of time Internet users spend on Facebook each month. How many Internet users must be surveyed in order to be 95% confident that your sample mean is within 15 minutes of the population mean? Based on results from a prior Nielsen survey,.
1. Write the signature of a constructor that matches the following object creation instruction:
new Editor(-1 , “readme.txt”)
2. Write Java statements that define a variable named window of the type Square, and then create a square object and assign it to that variable..
1. When applying the stepwise regression technique, _________ independent is included in the first multiple regression model.
2. In multiple regression analysis, a correlation matrix is used to check for ___________.
3. When evaluating the assumptions of a multiple regression model, a _______ is.
1. What does Nietzsche mean when he says "God is dead." In what ways has God died?
2. What does Nietzsche understand by a "geneaology of morality?"
3. What does it mean to affirm eternal recurrence?
.
1. What are the three steps of the kinematic analysis?
3. What are the three analytical techniques covered in class and what are the limitations of each?
4. Chace’s solution requires that the closure equation be written in a certain way; why? Is it.
1. Which of the following symbols stands for the population mean?
a. m
b. s
c. r
d. SD
2. Which of the following is a directional alternative hypothesis?
a. m1 >.
1. which of the following statements are not true?
a. a statistical hypothesis is a claim or surgeon either about the value of a single perimeter about the values of several parameters or about the form of an entire probability distribution
b. in any.
1. Which of the following is a correct statement?
a. two or more variables are confounded if their effects cannot be separated given the experimental data
b. two or more variables are confounded if they produce the same effects
c. variables.
1. Which distribution is helpful in testing hypotheses about variances?
binomial distribution
a)
F distribution
b)
normal distribution
c)
Poisson distribution
d)
exponential.
1. What is the relationship between margin of error and the width of a confidence interval?
Confidence interval width = 2 times the margin of error.
Confidence interval width = half of the margin of error.
Confidence interval width = margin.
1. What is the value of , the parameter of exponential distribution?
2. What is the standard deviation of time between successive arrivals?
3. What is the probability that the next drive thru arrival is between 2 to 4 minutes?
4..
1. You will perform a significance test of Ho: P = Po versus Ha:P>Po.
- What value of z would reject Ho at 5% significance level?
2. You will perform a significance test of Ho: P = Po versus Ha: P < Po.
.
1. Xtreme Fitness has several health and spa clubs in United States featuring yoga and massage facilities. An in-house study of monthly sales by three branches of Xtreme Fitness during the past year (a total of 36 observations) revealed the following (standard errors in parentheses): QY = 450 - 4PY.
1. With the Leboyer method of childbirth the child is born into a warm, quiet atmosphere and is gently massaged by both doctor and mother for 4 or 5 minutes. This is in contrast to the harsh lights, the activity, and the quick slap on the bottom found in the.
1. Which of the following is NOT true for the t distribution ? Its shape depends on the number of degrees of freedom Its mean depends on the number of degrees of freedom it is symmetrical It is bell shaped
2. A single number which is used.
1. You needn't be too concerned about violating the assumptions of the F test so long as (I know the answer is not A)
A) sample sizes are equal and very large
B) sample sizes are equal and larger than 10
.
1. You go to a store to get ice-cream. There are five types of cones, three types of ice-cream, and six kinds of toppings. You must choose a cone, a type of ice-cream, and exactly one topping. What is the number of possible choices?
2. Eight students.
1. Which of the following statements is not true with respect to the error in a multiple regression model?
a. The values of the error are independent.
b. The error is a random variable.
c. The mean value of the error.
1. When and why would you conduct post hoc tests as a follow up to the overall F test? a. When the overall F test is NOT significant; to determine which of the pairs of groups may be significant. b. When the overall F test is NOT significant; to determine.
1. You are playing billiards. There are 15 balls on the table (save the cue ball which we are ignoring) numbered 1, 2, ..., 15 and 6 pockets the balls can go into (4 corner pockets and two side pockets) The goal of the game you are playing is to.
1.- Which of the following situations is an example of a Type II error?
A) Finding an effect of diet soda on fatigue when an effect does NOT actually exist.
B) Finding an effect of diet soda on fatigue when an effect actually exists.
.
1. X and Y are discrete random variables with joint pmf (a) Find the marginal distribution of X. (b) Find the marginal distribution of Y. (c) Are X and Y independent? (d) Find E(XY).
.
1. What the of a is/are conducting a study with three or more levels of the dent variable? 2. What is the difference between a randomized ANOVA and a repeated measures ANO What does the term one-way mean with respect to an ANOVA? 3. Explain between-groups variance and within groups.
1. Which of the following statements do you think could possibly be true?
A. The number of students enrolled at Midville University decreased by 10.4% last year.
B. A basketball team took 20 free throws in a game last week and made 72.6% of.
1. Write the regression (prediction) equation
2.Identify and interpret the adjusted R2
3. Identify and interpret the F test: • Using the p-value approach, is the null hypothesis for the F test rejected or not rejected? Why or why not? • Interpret the implications.
1. When I open my mailbox, any piece of mail there has a 90% chance to be junk mail. If I get 9 items in my box today, what is the probability that exactly 3 of them are actually interesting (i.e. NOT junk mail)?
2. When I.
1. What is the value of the test statistic, the critical F value and the P value?
Help would be much appreciated
The accompanying data table lists measures of esteem from a student project. The objective of the project was to study how levels.
1. Which of the following events occur with a probability of 0?
A. An individual that runs quickly and swims slowly B. A coin toss lands on neither heads nor tails C. An organism that is neither an animal nor plant D. A top that is spinning.
1.) Which of the following statements is not true about the t-distribution?
______
A) Like the normal distribution, the t-distribution is symmetric and unimodal.
B) Since population standard deviation is usually unknown, the standard error uses the sample standard deviation to.
1. Your broker calls you with information about an investment opportunity. He informs you that the net profits from this investment are normally distributed and on average the net profit is $10,000. He urges you to make the investment since the standard deviation of the profits is $5,000. Based on.
1. Which of the following is NOT one of the three basic ways of describing results discussed in your text?
Correlate scores of individuals on two variables.
Compare group assignments
Compare group percentages.
Compare group means.
.
1. When Bob and Carl drink beer, the amounts of beer each one of them drinks (in ounces jointly follow a bivariate normal distribution with Lu R 84, OR 18, 60, Oc 15, BC
.
1. You find that men and women, on average, study study the same number of hours each night; however, the standard deviation for men is much larger. You may conclude that:
a. males are smarter than females
b. modal study hours for both groups.
1. When estimating a population mean, you must use t procedures rather than normal curve procedures when:
a. the sample size is less than 15, but not when it's at least 15.
b. the standard deviation is less than 10.
c..
1. what is the idea behind why there is twist in typical wind turbine blades?
2. eaplain the dilemma that foregin companies face when building plants and expanding their wind energy businesses into china.
3. what is the idea of the cascade of turbulence.
1. What is the probability of a z-score greater than -1.97?
2. What is the probability of a z-score greater than -0.02?
3. What is P(Z>2.22)?
Show your work
1. What is the probability of a z-score greater.
1). Which of the following statements about exponential smoothing is false?
a). It takes into account all earlier observations in the time series.
b). It’s like a weighted average method.
c). It gives the greatest weight to the earliest/oldest observation.
.
1. You collect unadjusted, quarterly data on nominal wages, unemployment, and prices in the United States from 1940 through 2011 from the United States Bureau of Labor and Statistics. Wages are the median wage in the United States in each quarter, the unemployment rate is reported for each quarter, and.
1. Write 2.96 as a mixed number or fraction in simplest form?
2.During a soccer game, Erin scored 1 out of 2 goals attempted. Lauren scored 6 out of 8 goals attempted. Write the fraction that represents each and compare. Who was the most successful?
.
1. Which of the following is not true of the median?
Select one:
a. It is a measure of central tendency
b. It is relatively easy to calculate
c. It is based on the whole distribution
.
