Suppose you found a z-statistic of 1.69.   If the alternative hypothesis is ?>5μ>5 , what would be the P-value?      If the alternative hypothesis is ?<5μ<5 , what would be the P-value?      If the alternative hypothesis is ?≠5μ≠5 , what would be the P-value?

N(6.2, 2.5)Using the empirical rule, approx what percentage of people spent less than 6.3 hours?Approximately what percentage of people spent more than 8.6 hours?

Suppose the mean and standard deviation of the GPAs at Tulane are Xbar = 2.899; and s = -0.753Charlie's GPA has a z-score of -0.140. What is Charlie's GPA?(Leave your answer to 2 decimals: ex: 1.23)

A sumple from a normal population with mu = 50 and sigma = 6 of M=48.20, . the sample mean.corresponds to tz = - 1.50 , then how many scores are in the sample?

If the population average height is 67" and you take a random sample of 25 people resulting in a sample average value of 66 with a standard deviation of 2. Determine the "t" score that you would use as a test score for this data, and solve it for "t".

You are a researcher studying the lifespan of a certain species of bacteria.  A preliminary sample of 35 bacteria reveals a sample mean of ¯x=76x¯=76 hours. The population standard deviation is known to be 5.6  hours.  You would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.4 hours at a 90% level of confidence. How many more bacteria should you sample to achieve a 0.4 hour margin of error? n =     bacteria

Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years. (Twenge, 2000). In the 1950s , the average score on the Child Manifest Anxiety Scale was ?= 15.1. A sample of n = 16 of today's children produces a mean score of M = 23.3 with SS = 240.  Based on the sample, has there been a significant increase in the average level of anxiety since the 1950s?  Use a one-tail test with α= .05. ****Is the critical region 1.753? Positive or Negative?**

Suppose the mean and standard deviation of the GPAs at school are Xbar = 1.654; and s = -0.562Adam's GPA has a z-score of -1.460. What is Adam's GPA?(Leave your answer to 2 decimals: ex: 1.23)

You are conducting a study to see if the probability of catching the flu this year is significantly less than 0.3. Thus you are performing a left-tailed test for a population proportion. Your sample data produce the test statistic z = -1.689. Find the p-value accurate to 4 decimal places. p-value=

Researchers wish to investigate whether anxiety in children has increased over time.  In 1950, the average score on the Child Manifest Anxiety Scale was µ= 15.1.  A sample of n = 16 was taken from children today, which produced a mean anxiety score of M= 23.3 with SS= 240. Based on the sample, has there been a significant change in the average level of childhood anxiety since 1950? (Use a 2-tailed test with α= .05) Write a sentence describing the outcome of the hypothesis test as it would appear in a research report.