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A study published in 1993 found that babies born at different times of the year may develop the ability to crawl at different ages! The author of the study suggested that these differences may be related to the temperature at the time the infant is 6 months old. (Benson and Janette, Infant Behavior and Development [1993])
a) The study found that 32 babies born in January crawled at an average age of 29.84 weeks, with a standard deviation of 7.08 weeks. Among 21 July babies, crawling ages averaged 33.64 weeks, with a standard deviation of 6.91 weeks. Is this difference significant?
b) For 26 babies born in April the mean and standard deviation were 31.84 and 6.21 weeks, while for 44 October babies the mean and standard deviation of crawling ages were 33.35 and 7.29 weeks. Is this difference significant?
c) Are these results consistent with the researcher s claim? (We'll examine these data in more detail in a later chapter.)
what is wrong with this statement? high linear correlation proves that the explanatory variable variable x caused the
health experts recommend that runners drink 4 ounces of water every 15 minutes they run.runners who run three to eight
1. the instructor in a humanities class says that students have a 15 probability of making an a in her class 20
Those who had consumed the vodka tonics had 35% more cravings than those who did not. Assuming that the assignment of subjects to the treatment (vodka) and control groups was made at random, do you think there are any confounding factors that woul..
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1. When using pointer control to read data in fixed columns, the _____ symbol moves the pointer to a specific column? This method is considered _____________ pointer control.
given the following sample data 104 110 114 97 105 113 106 101 100 107a give a point estimate of the population
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The standard deviation of the time to complete the entire homework assignment
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For example, electricity costs are $1,200 per month plus $0.15 per car washed. The company expects to wash 9,000 cars in August and to collect an average of $4.90 per car washed. Required: Prepare the company's planning budget for August.
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