Find the critical value needed to construct a confidence interval

Find the critical value needed to construct a confidence interval

According to a recent survey about 74% of families polled said that they regularly shop on black Friday suppose you are working in retail at a store that usually caters to 320 family assuming that...

A recent poll randomly selects 500 registered voters residing in Nassau County. For this sample, 245 respondents state that they are glad that the country has a nationwide health plan...

Number 1 A 95% confidence interval for the mean difference of the number days per month those who commute to work in a major city and take a bus and those who commute to work in a major city and...

Post-exposure radiation levels are approximately Normally distributed with mean μ. The levels (in Sv) of a random sample of three trauma victims who were recently exposed to radiation are 5.5, 6.2,...

a.) If one pregnancy is selected at random, what is the probability it will last more than 275 days? b.) What percentage of pregnancies last between 270 and 280 days? c...

A. Find the value of t for the t distribution for the following. Area in the right tail =0.05 and df=17. Round your answer to 3 decimal places...

The corner Convenience store kept track of the number of paying customers it had during the noon hour each day for 100 days. The resulting statistics are rounded to the nearest integer: mean =...

An IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students...

Hi, I have a question about hypothesis testing with two population mean. I have two populations (GPA and expected salary). Also, my research question is: Are the students with high average...

Using the sample statistics, construct a 99% confidence interval estimate of the mean body temperature of all healthy humans. Do the confidence interval limits contain 98.6 degrees°F? What does the...

Find the indicated probability using the standard normal distribution. P(0<z<0.525)?

help me give me the answers of 4 major components of statistics.

I have a question and I'm being asked to specify which test to use and then conduct it. However, the data given is non-numeric. the question statement is "males and females differ in whether...

What is the probability a random sample of size 20 will have a mean gestation period within 11 days of the mean? σ=13 μ=197

Assume that 80 percent of the adult population the united states has tested either coke or pepsi. For a sample of 250 adults, how many would you expect to have tasted either coke or pepsi? What is...

Suppose you are going to test the claim that 55% of adults prefer a window seat when they fly. The results of a poll indicated that 440 of 806 adults preferred a window...

Use the top home run hitter from each major league baseball team as the data set. Find the mean and the standard deviation for the number of home runs hit by the top hitter on each team. Be sure to...

a. 8 b. 4 c. 6 d. 2 I know the answer is 6, but I don't understand how it was obtained

I need help answering this question. A)0.065 B)0.000 C)0.1 D)0.100