A survey of 2300 randomly chosen American Adults found that 604 agreed that they had experienced insomnia in the last month.  Use this information to complete the following to find the corresponding 95% confidence interval. a. What is the point estimate of the proportion of American Adults that have experienced insomnia in the last month?  Round to three decimal places.  [answera] b. Does the sample meet the conditions to calculate the confidence interval for the proportion?           [answerb] because the sample is random, the sample is less than 5% of the population and [answerc]. c.  Use the appropriate formula to find the margin of error, rounded to three decimal places.  Remember to round off only at the end.  [answerd] d. Using the margin of error and point estimate from the above questions, find the 95% confidence interval for the proportion of American Adults who have experienced insomnia in the last month.  Round to three decimal places.  Choose the best answer.   [answere]  

Use the t-table to determine the critical value for a left tailed hypothesis test with a level of significance of 0.02.  The sample size is n = 94. 

A researcher wants to compare the proportion of residents of California who have visited a national park to the proportion of residents of Florida who have visited a national park.  A sample of 570 residents of California indicated that 27% of the sample had visited a national park.  A sample of 620 residents of Florida indicated that 24% of the sample had visited a national park.  At the 0.05 level of significance, test the claim that the proportion of residents of California who have visited a national park is greater than the proportion of residents of Florida who have visited a national park.   1) What is the correct null and alternative hypothesis?  Choose from the options below.  [answer1]                                   a.     H0: 

A study was done to determine the mean number of pets per household in a certain city. For the 60 households surveyed, the sample  was mean 2.1 pets and the sample standard deviation was 0.7 pets.  The distribution to use to calculate the 95% confidence interval is ________________.  

A study is done to determine the mean time that it takes an order to be filled at a drive-thru window.  The fulfilment times for 500 customers at a drive-thru window are recorded and this results in a 90% confidence interval of 92.4 seconds to 96.3 seconds. Which of the following best expresses the meaning of this confidence interval?  

Determine whether the underlined value represents a parameter or a statistic and why.  86% of all SMC students are from California. 

Suppose you want to test the claim that μ > 25.6. Given a sample size of n = 43 and a level of significance ofα = 0.10, when should you reject the null hypothesis?

A random sample of SMC math students are asked how much time (in minutes) they spend on math homework per day.  The responses are listed below.  Calculate the 95% confidence interval for the mean time an SMC math students spend on homework per day.  Assume that the conditions are met to calculate the interval.  Round the end points of the interval to one decimal place.  The units of the interval are minutes.  41     61     65     71     72     77     56     52     58     52

A study is to be done to determine the proportion of colleges graduates that would choose a different major if they could go back and redo college.  What minimum  sample size should be used if the study will have a 4.4% margin of error and a 90% confidence level?  

A city wants to determine the mean amount that residents pay in property taxes each year. At least how many residents should be polled to determine the mean property tax to within $2000 at 95% confidence? Assume that the city has estimated the standard deviation in property tax paid to be $35000.