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Randomly selected statistics students participated in an experiment to test their ability to determine when 1 min (or 60 sec) has passed. Forty students yielded a sample mean of 56.0 sec. Assuming that ? = 9.5 sec, use a 0.05 significance to test the claim that the population mean is equal to 60 sec. Based on the result, does there appear to be an overall perception of 1 min that is relatively close to an actual minute?
Identify the null hypothesis and alternative hypothesis.
Identify the test statistic
Identify the P-value
What is the final conclusion?
Cold this past winter and found out how long their cold symptoms lasted. Assuming that the Central Limit Theorem applies, give the sampling distribution of X for n = 50.
the application of a quadratic model for the revenue generated by manufacture and sale of a digital camera seems to
the lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. random
Suppose a t- test is being applied to find out if the population monthly expenditure mean is less than $212. The level of significance selected is 1% and 26 accounts are sampled. What is the critical value?
What is the mean amount spent on insurance? If we select a family at random, what is the probability they spend less than $2,000 per year on insurance per year?
What is the probability that of today's 1,100 callers at least 5 received a busy signal? Use the poisson approximation to the binomial.
What decision would be made if the researcher used a one-tailed test with an alpha level of .05? (Assume that the herb is expected to increase scores.)
A new cell phone battery is being considered as a replacement for the current one. Ten college student cell phone users are selected to try each battery in their usual mix of "talk" and "standby" and to record the number of hours until recharge wa..
the mean score of the first calculus exam was 81. the standard deviation was 12. find the smallest interval about the
Create an APA style table that presents descriptive statistics for variables
In you determine the GPA of 10 members of the class and then calculate the average, will the number you get necessarily be the same as the average GPA for the whole class? On what factors would you expect the reliability of the estimate to depend..
Estimated the probability that among 75 randomly selected students, at least 20 of them score greater than 78.
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