Choose the appropriate statistical test. When computing, be sure to round each answer as indicated.   A researcher believes that parents of teenagers get less sleep than parents of newborns. Teenager parents: Mean = 6.8 hours; Variance = 2; N = 30 Newborn parents: Mean = 6.4 hours; Variance = 3; N = 30   Calculate the first required formula (round to 1 decimal).  Calculate the second required formula (round to 2 decimals).  What is your t-obtained? (round to 3 decimals).  What is your t-cv? (exact value from table).  Should you Reject or Retain the null hypothesis? Only type "Reject" or "Retain"

Assume that a randomly selected subject is given a bone density test. Those test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find the bone density test scores that can be used as cutoff values separating the lowest 10% and highest 10%, indicating levels that are too low or too high, respectively. Sketch the region containing the lowest 10% and highest 10%. Choose the correct graph below. OA. -Za Za Q The bone density scores are ☐ OB. -Za Za (Use a comma to separate answers as needed. Round to two decimal places as needed.) ○ C. Q Za -Za D. Q a G Za -Za

Consider the following data x -4,-3,-2,-1,0 P(X=x) 0.3,0.1,0.2,0.1,0.3 Find the variance. Round your answer to one decimal place.

Each problem describes a research situation and the data it produces. Identify the statistical procedure or test that is appropriate for the data. Choose whether the problem requires one of the following: Descriptive statistics (Mean, Standard Deviations, Percentiles), one-sample t test, Independent-measures t test, Independent-measures ANOVAs (One-factor or Two-factor), Repeated-measures ANOVA, Linear Regression, Chi-Square Goodness-of-fit, Chi-Square Test of independence.  1) A researcher investigated different combinations of temperature and humidity to examine how heat affects performance. The researcher compared three temperature conditions (70º, 80º, and 90º) with a high humidity and a low humidity condition for each temperature. A separate group of participants was tested in each of the six different conditions. For each participant, the researcher recorded the number of errors on a problem-solving task. The researcher would like to know how different combinations of…