The data verb functions all take a data frame as their first argument and return a data frame as their output. The chaining syntax lets the output of one function become the input to the following function, so you do not have to repeat the name of the data frame. An alternative syntax is to assign the output of one function to a named object, then use the object as the first argument to the next function in the computation. Each of the following statements, EXCEPT one, will accomplish the same calculation. Identify the statement that does NOT match the others. a. BabyNames %>% group_by year, sex ) %>% summarise( totalBirths=sum(count))
b. group_by( BabyNames, year, sex) %>% summarise( totalBirths=sum (count))
c. group_by( BabyNames, year, sex ) %>% summarise( totalBirths=mean(count))
d. Tmp <- group_by (BabyNames, year, sex) summarise( Tmp, totalBirths=sum(count))

What is added to the < meta > tag to describe the encoding type?

Why might you chose to crest a function resume

7.23 main lab 7 - online shopping cart background this main lab extends the earlier prep lab "online shopping cart part 1". (you should save this as a separate project from the earlier prep lab). you will create an on-line shopping cart like you might use for your on-line purchases. the goal is to become comfortable with setting up classes and using objects. requirements this lab can be done individually or as pair programming. expanded itemtopurchase class (15 points) extend the itemtopurchase class as follows. we will not do unit testing in this lab so we will not be giving you the names of the member functions. create good ones on your own. create a parameterized constructor to assign item name, item description, item price, and item quantity (default values of "none" for name and description, and 0 for price and quantity). additional public member functions set an item description get an item description print the cost of an item - outputs the item name followed by the quantity, price, and subtotal (see example) print the description of an item - outputs the item name and description (see example) additional private data members a string for the description of the item. example output of the function which prints the cost of an item: bottled water 10 @ $1.50 = $15.00 example output of the function which prints the item description: