A research study measured the sounds generated during eating tortilla chips. Peak loudness was measured (in decibels at 20 cm away) for both open-mouth and closed-mouth chewing. A sample size of 10 chips was used for each trial. For open-mouth chewing the mean peak loudness was 60 decibels with a standard deviation of 15 decibels. For closed-mouth chewing the mean peak loudness was 53 decibels with a standard deviation of 16 decibels. Is there evidence that there is a difference (open-closed) in mean peak loudness for open and closed mouth chewing of tortilla chips? (

Sally deposited money into a savings account paying 4% simple interest per year. the first year, she earn $75 in interest. how much interest will she earn during the following year?

Arandomized controlled trial is designed to evaluate the effect of metoprolol in patients with heart failure. while preparing for statistical analysis, the researcher reviews some common types of statistical errors. which of the following statements is true regarding a type i error in a clinical study? a. the study is not significantly powered to detect a true difference between study groups. bthe null hypothesis is true but is rejected in error. c. the null hypothesis is false but is accepted in error. d. type i error is also known as beta and is usually 0.1 or 0.2. e. type i error depends on the study's confidence interval.

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