A psychologist obtains a random sample of 20 mothers in the first trimester of their pregnancy. The mothers are asked to play Mozart in the house at least 30 minutes each day until they give birth. After 5 years, the child is administered an IQ test. It is known that IQs are normally distributed with a mean of 100. If the IQs of the 20 children in the study result in a sample mean of 103.8 and sample standard deviation of 14.1, is there evidence that the children have higher IQs? Use the a = 0.10 level of significance. Determine the null and alternative hypotheses. Ho: μ = 100 H;: H (Type integers or decimals. Do not round.) 100 Which distribution should be used for this hypothesis test? O A. The chi-square distribution because the parameter iso or o, and the model conditions are satisfied. O B. The normal distribution because the parameter is the mean, o is known, and the model conditions are satisfied. OC. The normal distribution because the parameter is a proportion, p, and the model conditions are satisfied. O D. The Student's t-distribution because the parameter is the mean, o is not known, and the model conditions are satisfied.