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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 also recorded the average outdoor temperature (in °F) six months after each baby's birthdate. For each month of the year, the researchers selected one baby, at random, born in that month. If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
s = 1.319
The quantity s = 1.319 is an estimate of the standard deviation of the deviations in the simple linear regression model. The degrees of freedom for s2 areA. 1.74.B. 10.C. 11.6. 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.
Based on the equation of the least-squares line, we use software to predict the average number of home runs hit per game per team for the year 2001. We obtain the following.
A 95% prediction interval for the average number of home runs hit per game per team for the year 2001 isA. 1.9134 ± 0.545.B. (1.7481, 2.0786).C. 1.9134 ± 0.0817.
Suppose the true population proportion is 68%. What is the probability of observing a sample proportion 64% or smaller.
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02 for the October 26 evening showing of the same movie
Every year sixth-grade students in Ohio schools take proficiency tests.
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Using the 0.10 level of significance, is there evidence that the mean shopping time at the local supermarket is greater than the claimed value of 22 minutes?
The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart.
A jar contains 2 black marbles and 8 white marbles. If you randomly pick 2 marbles without replacement, what is the probability that you get one marble of each color?
The p-value of the test is closest to:
Experienced relief of both itchy eyes and skin rash. What is the probability that a patient who takes the drug will experience relief of at least one of two symptoms?
Linear equation that relates Celsius to Fahrenheit the oC is celsius in degrees and the oF is for Fahrenheit: Your company was very impressed with your results from the recent study. They have asked that you investigate another location for them an..
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