Do the sample ranges target the value of the population range? In general, do sample ranges make good estimators of population ranges? Why or why not?

Dawn Parker
2022-10-02

Do the sample ranges target the value of the population range? In general, do sample ranges make good estimators of population ranges? Why or why not?

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asked 2022-03-15

A study compared women who viewed high levels of television violence as children with those who did not in order to study the differences with regard to physical abuse of their partners as adults. Use the table shown below to calculate the observed value of the chi-square statistic. The table shows both actual counts and expected counts (in parentheses).

$\begin{array}{|ccc|}\hline & \text{High TV Violence}& \text{Low TV Violence}\\ \text{Yes, Physical Abuse}& 14(8.42)& 26(31.58)\\ \text{No Physical Abuse}& 22(27.58)& 109(103.42)\\ \hline\end{array}$

The chi-square statistic is ${\chi}^{2}=\square $

asked 2022-07-31

From 1980 to 2008, the number B$B$ of federally insured banks could be approximated by B(t)=−329t+13773$B\left(t\right)=-329t+13773$ where t is the year and t=0 corresponds to 1980.

Find the slope of the graph of B.

asked 2021-10-14

The following table summarizes the results of a study on SAT prep courses, comparing SAT scores of students in a private preparation class, a high school preparation class, and no preparation class. Use the information from the table to answer the remaining questions.

$\begin{array}{|cccc|}\hline \text{Treatment}& \text{Number of Observations}& \text{Sample Mean}& \text{Sum of Squares (SS)}\\ \text{Private prep class}& 60& 680& 265,500.00\\ \text{High school prep class}& 60& 650& 276,120.00\\ \text{No prep class}& 60& 635& 302,670.00\\ \hline\end{array}$

Using the data provided, complete the partial ANOVA summary table that follows (Hint: T, the treatment total, can be calculated as the sample mean times the number of observations G, the grand total, can be calculated from the values of T once you have calculated them.)

$\begin{array}{|cccc|}\hline \text{Source}& \text{Sum of Squares (SS)}& df& \text{Mean Square (MS)}\\ \text{Between treatments}& & & \\ \text{Within treatments}& & & \\ \hline\end{array}$

ANOVA summary tables typically have a "Total" row not induded in the partial table you just completed. Which of the following is a possible reason for induding this row?

a) The $M{S}_{\to tal}$ is used in the calculation of the F test statistic.

b) The $S{S}_{\to tal}$ is used in the calculation of the F test statistic.

c) The total sums of squares is the sometimes called the "error term"

d) The $S{S}_{total}$ is sometimes easier to calculate than. $S{S}_{between}$ Since $S{S}_{within}+S{S}_{between}=S{S}_{total}$, you can use $S{S}_{total}$ to calculate $S{S}_{between}$.

In ANOVA, the F test statistic is the ? of the between-treatments variance and the within-treatments variance. the value of the F test statistic is ?

When the null hypothesis is true, the F test statistic is ? When the null hypotesis is false, the F test statistic is most likely ? In general, you should reject the null hypotesis for.

asked 2022-06-17

The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 60 and a standard deviation of 7. Using the empirical rule (as presented in the book), what is the approximate percentage of lightbulb replacement requests numbering between 53 and 60?

Do not enter the percent symbol.

ans =

asked 2022-09-23

A group of investigators measured calcium intake in three different treatment groups. The data are provided in Table 1. The researchers used a one-way ANOVA test to compare the difference between three treatment groups. Using alpha=0.05, what would be their conclusion?

Fail to reject the null hypothesis and conclude that the three group have the same mean of Calcium measurement. Stop there.

Fail to reject the null hypothesis and conclude that the three groups do not have the same mean of Calcium measurement. Stop there.

Reject the null hypothesis and conclude that the three groups do not have the same mean of Calcium measurement. Move on with multiple comparisons.

Reject the null hypothesis and conclude that the three groups have the same mean of Calcium measurement. Move on with multiple comparisons.

asked 2022-04-15

The probability of an event to happen in the next week is p and It is constant throughout the week What is the probability of this event to happen in the next 2 days?

asked 2022-06-15

Assume that a procedure yields a binomial distribution with a trial repeated n=5$n=5$ times. Use some form of technology to find the probability distribution given the probability p=0.734$p=0.734$ of success on a single trial.*(Report answers accurate to 4 decimal places.)*