Question

3. A researcher claims that the mean annual cost of raising a child ( age 2 and under) by a husband-wife family in rural areas is $11,060. A random sample of husband-wife families of 800 children has an average cost of $10,920. Assume the population standard deviation is $1561. At 95% confidence level, is there enough evidence to reject the claim? State your null and alternate hypothesis for your test.( 10 points) 3b. The frequency distribution at right represents the distribution of grades on a certain statistics test. What is the mean and standard deviation of the grades grade? (10 points) Grade Frequency 50-59 2 60-69 3 70-79 6 80-89 7 90-99 4

          3. A researcher claims that the mean annual cost of raising a child ( age 2 and under) by a husband-wife family in rural areas is $11,060. A random sample of husband-wife families of 800 children has an average cost of $10,920. Assume the population standard deviation is $1561. At 95% confidence level, is there enough evidence to reject the claim? State your null and alternate hypothesis for your test.( 10 points)

3b. The frequency distribution at right represents the distribution of grades on a certain statistics test. What is the mean and standard deviation of the grades grade? (10 points)

Grade Frequency
50-59 2
60-69 3
70-79 6
80-89 7
90-99 4

3. A researcher claims that the mean annual cost of raising a child ( age 2 and under) by a husband-wife family in rural areas is 11,060. A random sample of husband-wife families of 800 children has an average cost of10,920. Assume the population standard deviation is 1561. At 95% confidence level, is there enough evidence to reject the claim? State your null and alternate hypothesis for your test.( 10 points)

3b. The frequency distribution at right represents the distribution of grades on a certain statistics test. What is the mean and standard deviation of the grades grade? (10 points)

Grade Frequency
50-59 2
60-69 3
70-79 6
80-89 7
90-99 4

Added by John P.

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