What are the quantities needed to construct a confidence interval around a sample mean when sigma is unknown? Question 3Answera.Sample mean, sample size, σ, level of confidence (1-α)b.Sample mean, sample size, estimated standard deviation, level of confidence (1-α)c.calculated t score, sample size, estimated standard deviation, level of confidence (1-α)d.Sample mean, sample size, σ, margin of error

Confidence interval for a single mean (σunknown)

You want to compute a 90% confidence interval for the mean of a population with unknown standard deviation. The sample size is 30. The correct distribution value for calculating the required confidence interval is:-Group of answer choices1.961.64491.6991.6971.311

Construct a 95% confidence interval for the population mean based on a sample of measurements2.6, 8.4, 3.0, 5.5, 6.4, 8.1if measurement errors have Normal distribution, and the measurement device guarantees a standard deviation of σ  = 2.3.

Assuming data come from a random sample, under which of the following conditions should we not calculate a confidence interval for a population mean? Population distribution is unknown and sample size is 50 individuals. Population distribution is unknown and sample size is 20 individuals. Population is normally distributed and sample size is 20 individuals. Population is normally distributed and sample size is 50 individuals.

Let’s say you wish to construct a sampling distribution of sample size 100 for the proportion of people that voted for AAP. Suppose the population standard deviation is known to be 0.7, what is the interval in which the mean of the sampling distribution will belong at a 90% confidence level?(0.485, 0.675) (0.572, 0.588)(0.465, 0.695)(0.503, 0.657)