An IQ test is designed so that the mean is 100 and the standard deviation is 12 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 4 IQ points of the true mean. Assume that o= 12 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation. The required sample size is www (Round up to the nearest integer.)

Define population and sample. List typical parameters from population and sample statistics.

What test can be used to test the difference between two means when the population standard deviations are known Ox² Oz Ot OF

please give some detailed solution and please do not copy other's work,thanks!! According to a union agreement, the mean income for all senior-level assembly-line workers in a large company is $500 per week. A representative of a women's group decides to analyse whether the mean income for female employees matches this norm. For a random sample of 50 female employees, the mean is $410 and the SD is $90. Test with a-0.05, whether the mean income of female employees differs from $500 per week. What is the probability of the Type II error in this case?