Error with answering Data Analysis: Central Tendency course item 17

[shirkey]

Within the Data Analysis: Central Tendency course, when prompted to enter cars into the R command prompt, swirl seems to disregard this as a correct answer -- even skip() results in an error message.

| You are quite good my friend!

  |==========================                           |  48%

| Which of the following terms are of most importance when
| describing the central tendency of a data set?

1: mode, median, mean
2: statistics, population, mode
3: median, mode, range
4: population, sample, representative

Selection: 1

| You're the best!

  |===========================                          |  52%

| To illustrate these concepts, we will now look at a real
| dataset from the 'openintro' R package, which has already
| been loaded for you. Type 'cars' and press Enter to see the
| dataset we'll be working with.

> 
> cars
      type price mpgCity driveTrain passengers weight
1    small  15.9      25      front          5   2705
2  midsize  33.9      18      front          5   3560
3  midsize  37.7      19      front          6   3405
4  midsize  30.0      22       rear          4   3640
5  midsize  15.7      22      front          6   2880
6    large  20.8      19      front          6   3470
7    large  23.7      16       rear          6   4105
8  midsize  26.3      19      front          5   3495
9    large  34.7      16      front          6   3620
10 midsize  40.1      16      front          5   3935
11 midsize  15.9      21      front          6   3195
12   large  18.8      17       rear          6   3910
13   large  18.4      20      front          6   3515
14   large  29.5      20      front          6   3570
15   small   9.2      29      front          5   2270
16   small  11.3      23      front          5   2670
17 midsize  15.6      21      front          6   3080
18   small  12.2      29      front          5   2295
19   large  19.3      20      front          6   3490
20   small   7.4      31      front          4   1845
21   small  10.1      23      front          5   2530
22 midsize  20.2      21      front          5   3325
23   large  20.9      18       rear          6   3950
24   small   8.4      46      front          4   1695
25   small  12.1      42      front          4   2350
26   small   8.0      29      front          5   2345
27   small  10.0      22      front          5   2620
28 midsize  13.9      20      front          5   2885
29 midsize  47.9      17       rear          5   4000
30 midsize  28.0      18      front          5   3510
31 midsize  35.2      18       rear          4   3515
32 midsize  34.3      17      front          6   3695
33   large  36.1      18       rear          6   4055
34   small   8.3      29      front          4   2325
35   small  11.6      28      front          5   2440
36 midsize  61.9      19       rear          5   3525
37 midsize  14.9      19       rear          5   3610
38   small  10.3      29      front          5   2295
39 midsize  26.1      18      front          5   3730
40   small  11.8      29      front          5   2545
41 midsize  21.5      21      front          5   3200
42 midsize  16.3      23      front          5   2890
43   large  20.7      19      front          6   3470
44   small   9.0      31      front          4   2350
45 midsize  18.5      19      front          5   3450
46   large  24.4      19      front          6   3495
47   small  11.1      28      front          5   2495
48   small   8.4      33        4WD          4   2045
49   small  10.9      25        4WD          5   2490
50   small   8.6      39      front          4   1965
51   small   9.8      32      front          5   2055
52 midsize  18.2      22      front          5   3030
53   small   9.1      25      front          4   2240
54 midsize  26.7      20      front          5   3245

| Not quite right, but keep trying. Or, type info() for more
| options.

| Type 'cars' and press Enter. Do not use quotes, spaces, or
| uppercase letters.

> cars
      type price mpgCity driveTrain passengers weight
1    small  15.9      25      front          5   2705
2  midsize  33.9      18      front          5   3560
3  midsize  37.7      19      front          6   3405
4  midsize  30.0      22       rear          4   3640
5  midsize  15.7      22      front          6   2880
6    large  20.8      19      front          6   3470
7    large  23.7      16       rear          6   4105
8  midsize  26.3      19      front          5   3495
9    large  34.7      16      front          6   3620
10 midsize  40.1      16      front          5   3935
11 midsize  15.9      21      front          6   3195
12   large  18.8      17       rear          6   3910
13   large  18.4      20      front          6   3515
14   large  29.5      20      front          6   3570
15   small   9.2      29      front          5   2270
16   small  11.3      23      front          5   2670
17 midsize  15.6      21      front          6   3080
18   small  12.2      29      front          5   2295
19   large  19.3      20      front          6   3490
20   small   7.4      31      front          4   1845
21   small  10.1      23      front          5   2530
22 midsize  20.2      21      front          5   3325
23   large  20.9      18       rear          6   3950
24   small   8.4      46      front          4   1695
25   small  12.1      42      front          4   2350
26   small   8.0      29      front          5   2345
27   small  10.0      22      front          5   2620
28 midsize  13.9      20      front          5   2885
29 midsize  47.9      17       rear          5   4000
30 midsize  28.0      18      front          5   3510
31 midsize  35.2      18       rear          4   3515
32 midsize  34.3      17      front          6   3695
33   large  36.1      18       rear          6   4055
34   small   8.3      29      front          4   2325
35   small  11.6      28      front          5   2440
36 midsize  61.9      19       rear          5   3525
37 midsize  14.9      19       rear          5   3610
38   small  10.3      29      front          5   2295
39 midsize  26.1      18      front          5   3730
40   small  11.8      29      front          5   2545
41 midsize  21.5      21      front          5   3200
42 midsize  16.3      23      front          5   2890
43   large  20.7      19      front          6   3470
44   small   9.0      31      front          4   2350
45 midsize  18.5      19      front          5   3450
46   large  24.4      19      front          6   3495
47   small  11.1      28      front          5   2495
48   small   8.4      33        4WD          4   2045
49   small  10.9      25        4WD          5   2490
50   small   8.6      39      front          4   1965
51   small   9.8      32      front          5   2055
52 midsize  18.2      22      front          5   3030
53   small   9.1      25      front          4   2240
54 midsize  26.7      20      front          5   3245

| Give it another try. Or, type info() for more options.

| Type 'cars' and press Enter. Do not use quotes, spaces, or
| uppercase letters.

> skip()

| I've entered the correct answer for you.

| Give it another try. Or, type info() for more options.

| Type 'cars' and press Enter. Do not use quotes, spaces, or
| uppercase letters.

> 

[ncarchedi]

Yes, thanks. This is a known bug caused by a recent change in one of swirl's dependencies. The fix is implemented in the development version of swirl and should be public within a week or so.

Cheers, Nick

[shirkey]

Thanks for the info Nick, cheers