IQ tests are scaled so that the mean score in a largepopulation should be μ =100. We suspect that the very-low-birth-weight population has mean score less than100. Infants weiging less than 1500 grams at birth are classed as "very low birth weight". Low birth weight carriesmany risks. One study followed 113 male infants with very low birth weight to adulthood. At age 20, the mean IQ score for these men was (x bar=87.6.) Iq scores vary Normally with standard deviation σ=15. Give a 95% confidence interval for the mean IQ score at age 20 for allvery-low-birth-weight males. Use the four-step process for confidence interval.

The 95% confidence interval is  

Step-by-step explanation:

From the question we are told that

    The  sample size is  

     The sample mean is    

      The standard deviation is  

Given that the confidence level is  95% then the level of significance is mathematically represented as

Next we obtain the critical value of   from the normal distribution table, the value  is  

Generally the margin of error is mathematically evaluated as

=>          

=>          

The  95% confidence interval is mathematically represented as

substituting values

step-by-step explanation: yes

circumference divided by 3.141592654 then timesthe radius twice

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice