Suppose you want to test the claim that μ = 3.5. Given a sample size of n = 51 and a level of significance ofα = 0.01, when should you reject the null hypothesis ?

For each of the following variables, determine whether the variable is qualitative, quantitative discrete or quantitative continuous, and then determine the level of measurement.  1. The exact time it takes to complete an exam.  [qu] and [level] 2. The size of an egg as median, large, extra large or jumbo.  [qu2] and [level2]

A study is to be done to determine whether taking a vitamin supplement will help lower cholesterol in people aged 65 and older.  A random sample of people aged 65 and older are randomly given either a placebo or a vitamin supplement to take daily for 4 weeks and each week their cholesterol is measured.  The researchers find that those taking the vitamin supplement on average lowered their cholesterol more than those taking the placebo.  1. Is this an observational or experimental study?  [exp]  Why?  [why]  2. What is the response variable?  [resp] 3. What is the explanatory variable? [expl]

Identify the type of sampling used.   A certain medical practice has 12 full-time doctors and they want to do a study about depression among their patients.  The practice randomly chooses 4 patients from each doctor and screens each for depression symptoms. 

Determine whether the sampling is dependent or independent.  Indicate whether the response variable is qualitative or quantitative.  A study is done to compare the how students feel about the quality of education they are receiving.  A sample of 250 Community college students show that 85% are satisfied with the quality of education.  A sample of 250 4-year college students showed that 77% are satisfied with the quality of education. 

The following data represent the prices of a round trip ticket from Los Angeles to Paris over spring break.  Use this information to find the indicated values.  Round the mean and standard deviation to the nearest whole number.  Give the quartiles to the nearest cent. $1352     $810     $919     $915     $1030     $915     $926     $1147     $789     $919      Find the following.  Summary Statistics What is the mean? [answer1] What is the median? [answer2] What is the standard deviation? [answer3] What is the first quartile?  [answer4] What is the is the 3rd quartile?  [answer5] Save these results for use in the next three questions. 

Use the t-table to determine the critical value for a left-tailed hypothesis test with a level of significance of 0.05.  The sample size is n = 63. 

A study of 4500 residents of New York City indicated that 2097 of them lived in a rental unit.  Answer each of the following.  a)  What is the population?  [pop] b) What is the sample?  [samp] c) What percentage of the residents of New York City lived in a rental unit?  [per]

The histogram below gives the frequency of temperatures recorded in a local city recently. Use the graph to answer the following questions.  1. On how many days was the temperature at least 80? [ans1] 2. What percentage of the days had a temperature below 75? [ans2] 3. What was the lowest temperature?[ans3]

A study of 1200 residents of Culver City indicated that 35.5% of them had attended the July 4th Fireworks. Answer each of the following. a)  What is the population?  [pop] b) What is the sample?  [sam] c) How many of the residents in the sample said they had attended the July 4th Fireworks?    [num]