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1. At what age do babies learn to crawl? Does it take longer to learn in the winter when babies are often bundled in clothes that restrict their movement? Data were collected at the University of Denver Infant Study Center, where parents and their babies participated in one of a number of experiments between 1988 and 1991. Parents reported the age (in weeks) at which their child was first able to creep or crawl a distance of four feet within one minute. The researchers planned to use simple linear regression to see if the age at which a baby was first able to crawl could be predicted from the average outdoor temperature six months after each baby's birthdate.
The explanatory variable in this study is
A. the average outdoor temperature six months after a baby's birthdate.B. the age (in weeks) at which a baby was first able to creep or crawl a distance of four feet within one minute.C. the extent to which parents honestly reported the age at which their baby was first able to crawl and didn't exaggerate in order to make their baby appear gifted.
2. Has the number of home runs hit by major league teams been increasing over time? For the 41 years from 1960 to 2000, the average number of home runs hit per game per team was computed. A simple linear regression was used to study the trend in the average number of home runs over the period 1960 to 2000, by using year to predict average number of home runs. The following results were obtained.
A 99% confidence interval for the slope of the least-squares regression line isA. 0.011145 ± 0.00685.B. 0.011145 ± 0.00873.C. 0.011145 ± 0.00916.
The random variable X has which of the following probability distributions and What is the probability that no student wins
determine if the improvement is of practical significance one should. Crop researchers plant 100 plots with a new variety of corn. The average yield for these plots is x' = 130 bushels per acre
Problems on Sampling Variability and Standard Error and Confidence Intervals
We are interested in comparing the proportions of males and females who think earning a large salary is very important to them. I surveyed 200 of each gender and recorded their answers to the question as yes or no.
Let X be the number of correct guesses by your friend in the 100 trials and Use the Normal approximation with the continuity correction - Which of the following might be reasonably modeled by the binomial distribution
A random variable has the density curve as in the graph below. Find The height of the density curve?
the maximum point total for the quarter was 200. The point totals for the 10 students are given in the stemplot below. For the density curve displayed below, which of the following is true?
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
how many chocolate chip cookies will he need to sample to estimate the mean to within 2, what is a 99% confidence interval for the average number of chips per cookie?
LINEAR PROGRAMMING MODELS
The 50 members of the placebo group had blood pressure lowered by an average of 15 points with standard deviation 8 points. To analyze this information we will use a, When testing whether or not the increases in spending are different, the test is ..
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
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