Mathematics, 12.08.2020 22:01 ayoismeisalex
A study was conducted to assess the effects that occur when children are exposed to cocaine before birth. Children were tested at age 4 for object assembly skill, which was described as a task requiring visual spatial skills related to mathematical competence. The 190 children born to cocaine users had a mean of 7.3 and a standard deviation of 3.0 The 186 children not exposed to cocaine had a mean score of 8.2 with a standard deviation of 3.0 Use a 0.05 significance level to test the claim that prenatal cocaine exposure is associated with lower scores of four year old children on the test of object assembly. What are null and alternative hypothesis? What is test statistics?
Answers: 3
Mathematics, 22.06.2019 00:00
At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad
Answers: 1
Mathematics, 22.06.2019 00:30
On the way home from visiting his family, vincent’s plane cruised at an altitude of 3.2 × 10^4 feet. he had heard that a man named felix baumgartner skydived from an altitude of 1.28 × 10^5 feet. vincent wants to know how much higher felix went on his skydiving trip. question 1 you have already seen how adding numbers works in either scientific notation or standard notation. but can you subtract numbers in scientific notation and get the same results as subtracting in standard notation? to find out, first solve vincent’s problem in standard notation. part a write the cruising altitude of vincent’s plane in standard notation.
Answers: 2
Mathematics, 22.06.2019 00:30
Suppose that the function f is defined. , for all real numbers, as follows. _ \ 1/4x² -4 if x≠-2 f(x)=< /_-1 if x=-2 find f(-5), f(-2), and f(4)
Answers: 3
A study was conducted to assess the effects that occur when children are exposed to cocaine before b...
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