The mean number of televisions per household in the U.S. is 2.24 televisions.  A researcher believes that the mean is lower in California.  A sample of 40 households in California results in a mean of 2.04 televisions with a standard deviation of 0.98 televisions.  At the 0.10 level of significance, test the claim by the researcher that the mean number of televisions per household in California is less than 2.24.  1.  What is the parameter being tested in this problem?  [paramterer] 2. Is the variable qualitative or quantitative?  [qual] 2. What are the correct null and alternative hypothesis for this problem?  [null]        a.  Ho:  

A researcher gathers data on the low overnight temperatures in a certain city during the month of October.  The five number summary is given below.  All temperature values are measured in degrees Fahrenheit.  Five-Number Summary: 1. 45oF 2. 55oF 3. 58oF 4. 63oF 5. 74oF Interpret the value of the third quartile in a contextualized sentence using the method from class.  [per] of overnight lows in this city in October were [amnt]. 

A college counselor is interested in comparing a student’s high school GPA and college GPA.  The GPA data for 5 random students is gathered and summarized in the following table.  Student 1 Student 2 Student 3 Student 4 Student 5 HS GPA 3.0 3.3 2.8 3.5 4.0 College GPA 2.7 3.5 2.6 3.1  3.8 Assume that the requirements of normalcy are met.  At the 0.05 level of significance, test the claim that a student’s high GPA is greater than a student’s college GPA. 1. What is the correct null and alternative hypothesis?  [null]      a.  Ho:  

Suppose that you determine that there is a significant linear relationship between the time a person spends sleeping the night before a cognitive test in hours (x) and their score on a cognitive test (y) and that the regression equation for the relationship is  y = 40.5 + 1.22x  Complete the following to interpret the y-intercept, if possible. [if][thenpredit][score]  

The speeds (in mph) of a sample of cars passing a certain checkpoint are measured by radar. The results are shown below measured in miles per hour (mph).  Answer the following questions based on this data set. Where rounding is necessary, round to one decimal place.  40        45        45        45        48        52        52        68       68     68 a) Find the mode(s).  [answer1] b) Find the mean. [answer2] c) Find the median. [answer3] d) Find the standard deviation. [answer4] e) Find the range.  [answer5]  

A factory is testing two different packaging machines.  For each machine a random sample of 10 boxes is chosen and the time, in seconds, that it takes to pack the box is measured.  The data is recorded in the table below.  Machine 1 Machine 2 41.9 42.3 42.9 42.1 41.8 40.8 41.5 42.9 42.7 43.0 42.8 42.9 41.4 43.4 41.2 42.2 42.7 42.6 41.9 42.0 Where rounding is necessary, round to two decimal places. 1. What is the point estimate of the mean packing time for Machine 1?  [mean1]  2. What is the point estimate of the mean packing time for Machine 2?  [mean2] 3. Find the 95% confidence interval for the difference in mean packing times for Machine 1 and Machine 2.  Assume that the conditions to compute the confidence interval are met.     We are 95% confident that the difference in the mean packing times for Machine 1 and Machine 2 is between [lower] seconds and [upper] seconds.  4. Based on the confidence interval, can you say that one of the machines has a lower mean packing time? [Yes] based on the confidence interval, we [can] say that [machine] has a lower mean packing time because [because].

A study is done to compare the proportion of kittens that are adopted from an animal shelter in their first week of availability to the proportion of adult cats that are adopted in their first week of eligibility.   A random sample of 204 kittens showed that 178 were adopted in their first week of eligibility.  A random sample of 449 adult cats showed that 362 were adopted in their first week of eligibility.  1. Rounded to three decimal places, what is the point estimate of the proportion of kittens that are adopted from an animal shelter in their first week of availability?    [kitprop] 2. Rounded to three decimal places, what is the point estimated of the proportion of adult cats that are adopted from an animal shelter in their first week of availability?  [adultprop] 3. Find the 95% confidence interval for the difference in the proportion of kittens and the proportion of adult cats that are adopted in their first week of eligibility.  Assume that the conditions to compute the confidence interval are met.     We are 95% confident that the true difference in the proportion of kittens and the proportion of adult cats that are adopted in their first week of eligibility is between [lower] and [upper].  (Round endpoints to three decimal places.) 4. Based on the confidence interval can you say (to 95% confidence) that the proportion of kittens adopted during their first week of eligibility is higher than the proportion of adult cats adopted during their first week of eligibility?   [yes] we [can] say that the proportion for kittens is higher [because]. 5. Which of the following is the correct meaning of the 95% confidence level?  [meaning]

Autonomic neurons that secrete the neurotransmitter acetylcholine:

A lamella is

Which of the following is the correct order of the steps in the production of an auditory sensation?1 – The pressure waves distort the basilar membrane on their way to the round window.2 – Vibration of the basilar membrane causes vibration of hair cells against the tectorial membrane.3 – Movement of the stapes at the oval window establishes pressure waves in the perilymph of the vestibular duct.4 – Sound waves arrive at the tympanic membrane.5 – Information concerning the frequency and intensity of stimulation is relayed to the CNS.6 – Movement of the tympanic membrane causes displacement of the auditory ossicles.